cluster/README.md: update notes about content
cluster/README.md: update notes about content

- Adjust the link to point at https://kubernetes.io/docs/setup/
to alternative solutions.
https://kubernetes.io/docs/getting-started-guides already redirects to
https://kubernetes.io/docs/setup/ and it does not contain details on
/cluster usage.
- Remove notes about the contents of the folder, leaving only the
deprecation notice and link to alternatives.

joelsmith/kubernetes,tallclair/kubernetes,alejandroEsc/kubernetes,rnaveiras/kubernetes,zetaab/kubernetes,tomzhang/kubernetes,micahhausler/kubernetes,iterion/kubernetes,mikedanese/kubernetes,kpgriffith/kubernetes,tomzhang/kubernetes,shyamjvs/kubernetes,jackfrancis/kubernetes,warmchang/kubernetes,zhouhaibing089/kubernetes,x13n/kubernetes,jessfraz/kubernetes,krmayankk/kubernetes,idvoretskyi/kubernetes,fgimenez/kubernetes,yarntime/kubernetes,mYmNeo/kubernetes,humblec/kubernetes,johscheuer/kubernetes,wongma7/kubernetes,shyamjvs/kubernetes,zetaab/kubernetes,fanzhangio/kubernetes,yujuhong/kubernetes,coolsvap/kubernetes,thockin/kubernetes,ravilr/kubernetes,mYmNeo/kubernetes,maciaszczykm/kubernetes,verult/kubernetes,warmchang/kubernetes,tcnghia/kubernetes,sanjeevm0/kubernetes,mosoft521/kubernetes,yarntime/kubernetes,ravilr/kubernetes,ravisantoshgudimetla/kubernetes,kpgriffith/kubernetes,iterion/kubernetes,enj/kubernetes,monopole/kubernetes,dlorenc/kubernetes,zhangmingld/kubernetes,erwinvaneyk/kubernetes,wongma7/kubernetes,enj/kubernetes,gnufied/kubernetes,ping035627/kubernetes,dlorenc/kubernetes,BenTheElder/kubernetes,rrati/kubernetes,iterion/kubernetes,cblecker/kubernetes,MHBauer/kubernetes,nikhita/kubernetes,linux-on-ibm-z/kubernetes,kevensen/kubernetes,mYmNeo/kubernetes,dixudx/kubernetes,zetaab/kubernetes,Lion-Wei/kubernetes,MikeSpreitzer/kubernetes,matthyx/kubernetes,cofyc/kubernetes,tallclair/kubernetes,humblec/kubernetes,BenTheElder/kubernetes,csrwng/kubernetes,tomzhang/kubernetes,matthyx/kubernetes,verb/kubernetes,ingvagabund/kubernetes,tengqm/kubernetes,idvoretskyi/kubernetes,BenTheElder/kubernetes,tengqm/kubernetes,kevin-wangzefeng/kubernetes,wanghaoran1988/kubernetes,olivierlemasle/kubernetes,klaus1982/kubernetes,andrewsykim/kubernetes,micahhausler/kubernetes,ii/kubernetes,olivierlemasle/kubernetes,Lion-Wei/kubernetes,mahak/kubernetes,iterion/kubernetes,cofyc/kubernetes,verult/kubernetes,ping035627/kubernetes,carlory/kubernetes,jackfrancis/kubernetes,tpepper/kubernetes,sdminonne/kubernetes,k82cn/kubernetes,xlgao-zju/kubernetes,hex108/kubernetes,olivierlemasle/kubernetes,verb/kubernetes,mahak/kubernetes,rnaveiras/kubernetes,brendandburns/kubernetes,li-ang/kubernetes,chestack/kubernetes,mikebrow/kubernetes,pires/kubernetes,brendandburns/kubernetes,xlgao-zju/kubernetes,andrewsykim/kubernetes,andrewrynhard/kubernetes,Clarifai/kubernetes,liggitt/kubernetes,k82cn/kubernetes,wongma7/kubernetes,dereknex/kubernetes,weiwei04/kubernetes,spzala/kubernetes,ii/kubernetes,jsafrane/kubernetes,idvoretskyi/kubernetes,kubernetes/kubernetes,JacobTanenbaum/kubernetes,coolsvap/kubernetes,matthyx/kubernetes,mkumatag/kubernetes,sdminonne/kubernetes,bparees/kubernetes,fanzhangio/kubernetes,kubernetes/kubernetes,alejandroEsc/kubernetes,jdef/kubernetes,dims/kubernetes,alejandroEsc/kubernetes,ravisantoshgudimetla/kubernetes,erwinvaneyk/kubernetes,rrati/kubernetes,warmchang/kubernetes,cblecker/kubernetes,jackfrancis/kubernetes,tpepper/kubernetes,roberthbailey/kubernetes,dims/kubernetes,ingvagabund/kubernetes,dixudx/kubernetes,zetaab/kubernetes,lojies/kubernetes,mosoft521/kubernetes,openshift/kubernetes,dixudx/kubernetes,wanghaoran1988/kubernetes,mahak/kubernetes,andrewsykim/kubernetes,k82cn/kubernetes,GulajavaMinistudio/kubernetes,jagosan/kubernetes,xlgao-zju/kubernetes,monopole/kubernetes,johscheuer/kubernetes,stevesloka/kubernetes,cofyc/kubernetes,brendandburns/kubernetes,PI-Victor/kubernetes,tengqm/kubernetes,linux-on-ibm-z/kubernetes,kitt1987/kubernetes,roberthbailey/kubernetes,GulajavaMinistudio/kubernetes,iameli/kubernetes,rnaveiras/kubernetes,k82/kubernetes,ii/kubernetes,li-ang/kubernetes,ravisantoshgudimetla/kubernetes,nak3/kubernetes,iameli/kubernetes,zhangmingld/kubernetes,monopole/kubernetes,linux-on-ibm-z/kubernetes,verb/kubernetes,verult/kubernetes,pires/kubernetes,pires/kubernetes,stevesloka/kubernetes,weiwei04/kubernetes,iterion/kubernetes,krmayankk/kubernetes,dlorenc/kubernetes,nckturner/kubernetes,rafax/kubernetes,kevensen/kubernetes,cofyc/kubernetes,csrwng/kubernetes,erwinvaneyk/kubernetes,tpepper/kubernetes,PiotrProkop/kubernetes,MHBauer/kubernetes,x13n/kubernetes,gnufied/kubernetes,MHBauer/kubernetes,fgimenez/kubernetes,x13n/kubernetes,andrewrynhard/kubernetes,saad-ali/kubernetes,kpgriffith/kubernetes,kevensen/kubernetes,micahhausler/kubernetes,iameli/kubernetes,du2016/kubernetes,ravilr/kubernetes,cmluciano/kubernetes,stevesloka/kubernetes,fabriziopandini/kubernetes,maciaszczykm/kubernetes,aledbf/kubernetes,joelsmith/kubernetes,alejandroEsc/kubernetes,mYmNeo/kubernetes,dixudx/kubernetes,tallclair/kubernetes,Acidburn0zzz/kubernetes,hex108/kubernetes,mengqiy/kubernetes,erwinvaneyk/kubernetes,nikhita/kubernetes,johscheuer/kubernetes,sanjeevm0/kubernetes,xychu/kubernetes,klaus1982/kubernetes,dims/kubernetes,Clarifai/kubernetes,cblecker/kubernetes,kevin-wangzefeng/kubernetes,BenTheElder/kubernetes,zhangmingld/kubernetes,joelsmith/kubernetes,cmluciano/kubernetes,MHBauer/kubernetes,deads2k/kubernetes,mkumatag/kubernetes,tomzhang/kubernetes,spzala/kubernetes,x13n/kubernetes,csrwng/kubernetes,stevesloka/kubernetes,matthyx/kubernetes,mikebrow/kubernetes,krmayankk/kubernetes,roberthbailey/kubernetes,saad-ali/kubernetes,erwinvaneyk/kubernetes,mYmNeo/kubernetes,chrislovecnm/kubernetes,iameli/kubernetes,linux-on-ibm-z/kubernetes,cmluciano/kubernetes,k82/kubernetes,micahhausler/kubernetes,klaus1982/kubernetes,jessfraz/kubernetes,brendandburns/kubernetes,gnufied/kubernetes,stevesloka/kubernetes,sanjeevm0/kubernetes,mfojtik/kubernetes,tallclair/kubernetes,tcnghia/kubernetes,coolsvap/kubernetes,deads2k/kubernetes,roberthbailey/kubernetes,k82cn/kubernetes,saad-ali/kubernetes,chestack/kubernetes,fanzhangio/kubernetes,xychu/kubernetes,mahak/kubernetes,wanghaoran1988/kubernetes,liggitt/kubernetes,yarntime/kubernetes,nikhita/kubernetes,spzala/kubernetes,mfojtik/kubernetes,sdminonne/kubernetes,luxas/kubernetes,xlgao-zju/kubernetes,tcnghia/kubernetes,sanjeevm0/kubernetes,mikedanese/kubernetes,GulajavaMinistudio/kubernetes,joelsmith/kubernetes,kevensen/kubernetes,krmayankk/kubernetes,luxas/kubernetes,dereknex/kubernetes,ping035627/kubernetes,feiskyer/kubernetes,verb/kubernetes,jingxu97/kubernetes,csrwng/kubernetes,ingvagabund/kubernetes,yujuhong/kubernetes,andrewrynhard/kubernetes,Acidburn0zzz/kubernetes,gnufied/kubernetes,MHBauer/kubernetes,jsafrane/kubernetes,jingxu97/kubernetes,zhangmingld/kubernetes,coolsvap/kubernetes,Acidburn0zzz/kubernetes,tcnghia/kubernetes,PiotrProkop/kubernetes,roberthbailey/kubernetes,rafax/kubernetes,mkumatag/kubernetes,carlory/kubernetes,du2016/kubernetes,feiskyer/kubernetes,liggitt/kubernetes,shyamjvs/kubernetes,jsafrane/kubernetes,matthyx/kubernetes,chrislovecnm/kubernetes,kpgriffith/kubernetes,bparees/kubernetes,rrati/kubernetes,xychu/kubernetes,nckturner/kubernetes,iameli/kubernetes,xlgao-zju/kubernetes,mfojtik/kubernetes,jessfraz/kubernetes,Clarifai/kubernetes,jackfrancis/kubernetes,luxas/kubernetes,brendandburns/kubernetes,tomzhang/kubernetes,feiskyer/kubernetes,rnaveiras/kubernetes,jdef/kubernetes,wanghaoran1988/kubernetes,PI-Victor/kubernetes,hex108/kubernetes,mkumatag/kubernetes,iterion/kubernetes,PI-Victor/kubernetes,fabriziopandini/kubernetes,nckturner/kubernetes,mikebrow/kubernetes,feiskyer/kubernetes,andrewsykim/kubernetes,bparees/kubernetes,coolsvap/kubernetes,soltysh/kubernetes,klaus1982/kubernetes,zetaab/kubernetes,dims/kubernetes,chestack/kubernetes,aledbf/kubernetes,mikedanese/kubernetes,dims/kubernetes,ingvagabund/kubernetes,soltysh/kubernetes,sanjeevm0/kubernetes,humblec/kubernetes,hex108/kubernetes,dixudx/kubernetes,k82cn/kubernetes,hex108/kubernetes,ravilr/kubernetes,ravisantoshgudimetla/kubernetes,tallclair/kubernetes,johscheuer/kubernetes,warmchang/kubernetes,ii/kubernetes,ravisantoshgudimetla/kubernetes,cmluciano/kubernetes,mengqiy/kubernetes,kitt1987/kubernetes,nikhita/kubernetes,sdminonne/kubernetes,luxas/kubernetes,sanjeevm0/kubernetes,fabriziopandini/kubernetes,kpgriffith/kubernetes,fgimenez/kubernetes,tpepper/kubernetes,mengqiy/kubernetes,brendandburns/kubernetes,xychu/kubernetes,fabriziopandini/kubernetes,saad-ali/kubernetes,tcnghia/kubernetes,wanghaoran1988/kubernetes,Lion-Wei/kubernetes,saad-ali/kubernetes,MikeSpreitzer/kubernetes,yarntime/kubernetes,yujuhong/kubernetes,alejandroEsc/kubernetes,maciaszczykm/kubernetes,fabriziopandini/kubernetes,openshift/kubernetes,jagosan/kubernetes,yujuhong/kubernetes,zhouhaibing089/kubernetes,verb/kubernetes,mikebrow/kubernetes,tomzhang/kubernetes,kitt1987/kubernetes,soltysh/kubernetes,k82/kubernetes,carlory/kubernetes,BenTheElder/kubernetes,ingvagabund/kubernetes,erwinvaneyk/kubernetes,du2016/kubernetes,wanghaoran1988/kubernetes,jingxu97/kubernetes,Lion-Wei/kubernetes,deads2k/kubernetes,zhouhaibing089/kubernetes,kevin-wangzefeng/kubernetes,pires/kubernetes,zhouhaibing089/kubernetes,li-ang/kubernetes,li-ang/kubernetes,MikeSpreitzer/kubernetes,jingxu97/kubernetes,nak3/kubernetes,chrislovecnm/kubernetes,verult/kubernetes,chrislovecnm/kubernetes,Lion-Wei/kubernetes,shyamjvs/kubernetes,Clarifai/kubernetes,dereknex/kubernetes,jingxu97/kubernetes,dlorenc/kubernetes,verult/kubernetes,rafax/kubernetes,kubernetes/kubernetes,warmchang/kubernetes,mikedanese/kubernetes,ingvagabund/kubernetes,cmluciano/kubernetes,nckturner/kubernetes,csrwng/kubernetes,fgimenez/kubernetes,maciaszczykm/kubernetes,PiotrProkop/kubernetes,lojies/kubernetes,mikedanese/kubernetes,humblec/kubernetes,weiwei04/kubernetes,kevin-wangzefeng/kubernetes,nak3/kubernetes,du2016/kubernetes,zetaab/kubernetes,ravilr/kubernetes,krmayankk/kubernetes,yarntime/kubernetes,idvoretskyi/kubernetes,hex108/kubernetes,PI-Victor/kubernetes,zhangmingld/kubernetes,k82/kubernetes,jdef/kubernetes,openshift/kubernetes,kpgriffith/kubernetes,liggitt/kubernetes,JacobTanenbaum/kubernetes,rrati/kubernetes,nckturner/kubernetes,weiwei04/kubernetes,idvoretskyi/kubernetes,shyamjvs/kubernetes,kubernetes/kubernetes,saad-ali/kubernetes,mfojtik/kubernetes,PiotrProkop/kubernetes,Lion-Wei/kubernetes,li-ang/kubernetes,Acidburn0zzz/kubernetes,chestack/kubernetes,Clarifai/kubernetes,dlorenc/kubernetes,wongma7/kubernetes,kevensen/kubernetes,lojies/kubernetes,spzala/kubernetes,MikeSpreitzer/kubernetes,pires/kubernetes,cblecker/kubernetes,k82/kubernetes,andrewrynhard/kubernetes,idvoretskyi/kubernetes,rrati/kubernetes,Clarifai/kubernetes,JacobTanenbaum/kubernetes,tomzhang/kubernetes,liggitt/kubernetes,dlorenc/kubernetes,MikeSpreitzer/kubernetes,verult/kubernetes,fanzhangio/kubernetes,johscheuer/kubernetes,nak3/kubernetes,andrewsykim/kubernetes,kitt1987/kubernetes,GulajavaMinistudio/kubernetes,deads2k/kubernetes,zhouhaibing089/kubernetes,dereknex/kubernetes,linux-on-ibm-z/kubernetes,PI-Victor/kubernetes,jdef/kubernetes,luxas/kubernetes,soltysh/kubernetes,lojies/kubernetes,lojies/kubernetes,joelsmith/kubernetes,tomzhang/kubernetes,ravisantoshgudimetla/kubernetes,enj/kubernetes,feiskyer/kubernetes,deads2k/kubernetes,weiwei04/kubernetes,kevin-wangzefeng/kubernetes,fanzhangio/kubernetes,nikhita/kubernetes,ping035627/kubernetes,coolsvap/kubernetes,mkumatag/kubernetes,kitt1987/kubernetes,andrewrynhard/kubernetes,bparees/kubernetes,du2016/kubernetes,MHBauer/kubernetes,mengqiy/kubernetes,jackfrancis/kubernetes,jessfraz/kubernetes,openshift/kubernetes,mikebrow/kubernetes,jdef/kubernetes,yarntime/kubernetes,nak3/kubernetes,x13n/kubernetes,johscheuer/kubernetes,mosoft521/kubernetes,carlory/kubernetes,tpepper/kubernetes,GulajavaMinistudio/kubernetes,monopole/kubernetes,fgimenez/kubernetes,thockin/kubernetes,mfojtik/kubernetes,yujuhong/kubernetes,soltysh/kubernetes,ping035627/kubernetes,krmayankk/kubernetes,carlory/kubernetes,tpepper/kubernetes,humblec/kubernetes,cblecker/kubernetes,xychu/kubernetes,Acidburn0zzz/kubernetes,aledbf/kubernetes,weiwei04/kubernetes,aledbf/kubernetes,rafax/kubernetes,jsafrane/kubernetes,openshift/kubernetes,cofyc/kubernetes,jagosan/kubernetes,cofyc/kubernetes,mosoft521/kubernetes,xychu/kubernetes,chrislovecnm/kubernetes,xlgao-zju/kubernetes,mYmNeo/kubernetes,sdminonne/kubernetes,tengqm/kubernetes,aledbf/kubernetes,stevesloka/kubernetes,mfojtik/kubernetes,thockin/kubernetes,olivierlemasle/kubernetes,mahak/kubernetes,jsafrane/kubernetes,tengqm/kubernetes,kubernetes/kubernetes,andrewrynhard/kubernetes,tcnghia/kubernetes,luxas/kubernetes,maciaszczykm/kubernetes,enj/kubernetes,kitt1987/kubernetes,fanzhangio/kubernetes,JacobTanenbaum/kubernetes,rnaveiras/kubernetes,jagosan/kubernetes,JacobTanenbaum/kubernetes,mosoft521/kubernetes,monopole/kubernetes,andrewsykim/kubernetes,joelsmith/kubernetes,jessfraz/kubernetes,nak3/kubernetes,dereknex/kubernetes,dereknex/kubernetes,mengqiy/kubernetes,x13n/kubernetes,PI-Victor/kubernetes,pires/kubernetes,gnufied/kubernetes,enj/kubernetes,cmluciano/kubernetes,fgimenez/kubernetes,JacobTanenbaum/kubernetes,chestack/kubernetes,zhangmingld/kubernetes,ii/kubernetes,micahhausler/kubernetes,wongma7/kubernetes,PiotrProkop/kubernetes,thockin/kubernetes,jagosan/kubernetes,chrislovecnm/kubernetes,jdef/kubernetes,tomzhang/kubernetes,olivierlemasle/kubernetes,thockin/kubernetes,yujuhong/kubernetes,maciaszczykm/kubernetes,tallclair/kubernetes,bparees/kubernetes,spzala/kubernetes,Acidburn0zzz/kubernetes