doc: Recommend avoiding Vagrant install on slow connections.
doc: Recommend avoiding Vagrant install on slow connections.

Per #1508, the manual install process is better
for the developer environment on slow connections.

vabs22/zulip,timabbott/zulip,krtkmj/zulip,shubhamdhama/zulip,andersk/zulip,zacps/zulip,aakash-cr7/zulip,JPJPJPOPOP/zulip,kou/zulip,amyliu345/zulip,zulip/zulip,brockwhittaker/zulip,j831/zulip,jrowan/zulip,umkay/zulip,dhcrzf/zulip,aakash-cr7/zulip,christi3k/zulip,j831/zulip,sonali0901/zulip,krtkmj/zulip,tommyip/zulip,reyha/zulip,jackrzhang/zulip,punchagan/zulip,vabs22/zulip,samatdav/zulip,punchagan/zulip,paxapy/zulip,PhilSk/zulip,AZtheAsian/zulip,niftynei/zulip,punchagan/zulip,SmartPeople/zulip,grave-w-grave/zulip,kou/zulip,jainayush975/zulip,susansls/zulip,mahim97/zulip,shubhamdhama/zulip,timabbott/zulip,rht/zulip,TigorC/zulip,mahim97/zulip,jackrzhang/zulip,Galexrt/zulip,hackerkid/zulip,hackerkid/zulip,j831/zulip,krtkmj/zulip,amyliu345/zulip,jackrzhang/zulip,arpith/zulip,souravbadami/zulip,andersk/zulip,showell/zulip,grave-w-grave/zulip,aakash-cr7/zulip,sharmaeklavya2/zulip,dattatreya303/zulip,arpith/zulip,ahmadassaf/zulip,krtkmj/zulip,SmartPeople/zulip,eeshangarg/zulip,susansls/zulip,jrowan/zulip,sup95/zulip,Jianchun1/zulip,niftynei/zulip,rishig/zulip,zulip/zulip,andersk/zulip,Galexrt/zulip,tommyip/zulip,rishig/zulip,rht/zulip,tommyip/zulip,brockwhittaker/zulip,shubhamdhama/zulip,mohsenSy/zulip,christi3k/zulip,rht/zulip,jrowan/zulip,ryanbackman/zulip,showell/zulip,synicalsyntax/zulip,niftynei/zulip,Jianchun1/zulip,blaze225/zulip,tommyip/zulip,brainwane/zulip,tommyip/zulip,Galexrt/zulip,isht3/zulip,eeshangarg/zulip,zacps/zulip,vikas-parashar/zulip,punchagan/zulip,AZtheAsian/zulip,JPJPJPOPOP/zulip,grave-w-grave/zulip,brainwane/zulip,christi3k/zulip,aakash-cr7/zulip,brainwane/zulip,reyha/zulip,aakash-cr7/zulip,zacps/zulip,dawran6/zulip,zulip/zulip,hackerkid/zulip,sharmaeklavya2/zulip,brockwhittaker/zulip,timabbott/zulip,christi3k/zulip,jphilipsen05/zulip,umkay/zulip,rht/zulip,ahmadassaf/zulip,amanharitsh123/zulip,jainayush975/zulip,samatdav/zulip,vaidap/zulip,vabs22/zulip,kou/zulip,calvinleenyc/zulip,zulip/zulip,dhcrzf/zulip,paxapy/zulip,Jianchun1/zulip,peguin40/zulip,mohsenSy/zulip,verma-varsha/zulip,andersk/zulip,eeshangarg/zulip,timabbott/zulip,PhilSk/zulip,ryanbackman/zulip,niftynei/zulip,vabs22/zulip,mohsenSy/zulip,SmartPeople/zulip,jphilipsen05/zulip,mohsenSy/zulip,vikas-parashar/zulip,joyhchen/zulip,vaidap/zulip,peguin40/zulip,blaze225/zulip,JPJPJPOPOP/zulip,hackerkid/zulip,Juanvulcano/zulip,blaze225/zulip,Juanvulcano/zulip,isht3/zulip,krtkmj/zulip,Galexrt/zulip,vikas-parashar/zulip,andersk/zulip,rht/zulip,joyhchen/zulip,dattatreya303/zulip,ahmadassaf/zulip,souravbadami/zulip,niftynei/zulip,umkay/zulip,Diptanshu8/zulip,souravbadami/zulip,isht3/zulip,dawran6/zulip,dawran6/zulip,ryanbackman/zulip,brainwane/zulip,synicalsyntax/zulip,mahim97/zulip,joyhchen/zulip,Jianchun1/zulip,jphilipsen05/zulip,TigorC/zulip,umkay/zulip,Galexrt/zulip,dhcrzf/zulip,dattatreya303/zulip,showell/zulip,TigorC/zulip,ahmadassaf/zulip,vikas-parashar/zulip,hackerkid/zulip,joyhchen/zulip,blaze225/zulip,PhilSk/zulip,verma-varsha/zulip,arpith/zulip,kou/zulip,peguin40/zulip,sharmaeklavya2/zulip,mahim97/zulip,vikas-parashar/zulip,amanharitsh123/zulip,tommyip/zulip,rht/zulip,brockwhittaker/zulip,jainayush975/zulip,brockwhittaker/zulip,amanharitsh123/zulip,zacps/zulip,umkay/zulip,ryanbackman/zulip,verma-varsha/zulip,cosmicAsymmetry/zulip,rht/zulip,kou/zulip,shubhamdhama/zulip,sharmaeklavya2/zulip,jphilipsen05/zulip,paxapy/zulip,joyhchen/zulip,arpith/zulip,zulip/zulip,JPJPJPOPOP/zulip,j831/zulip,joyhchen/zulip,calvinleenyc/zulip,punchagan/zulip,cosmicAsymmetry/zulip,dhcrzf/zulip,jackrzhang/zulip,Diptanshu8/zulip,sonali0901/zulip,cosmicAsymmetry/zulip,verma-varsha/zulip,samatdav/zulip,zacps/zulip,KingxBanana/zulip,synicalsyntax/zulip,ahmadassaf/zulip,timabbott/zulip,calvinleenyc/zulip,calvinleenyc/zulip,andersk/zulip,dattatreya303/zulip,dattatreya303/zulip,eeshangarg/zulip,Jianchun1/zulip,TigorC/zulip,eeshangarg/zulip,synicalsyntax/zulip,christi3k/zulip,TigorC/zulip,grave-w-grave/zulip,PhilSk/zulip,synicalsyntax/zulip,vikas-parashar/zulip,dawran6/zulip,samatdav/zulip,amyliu345/zulip,krtkmj/zulip,rishig/zulip,sup95/zulip,sup95/zulip,cosmicAsymmetry/zulip,Diptanshu8/zulip,isht3/zulip,PhilSk/zulip,AZtheAsian/zulip,amanharitsh123/zulip,showell/zulip,peguin40/zulip,mohsenSy/zulip,Juanvulcano/zulip,Jianchun1/zulip,susansls/zulip,jrowan/zulip,cosmicAsymmetry/zulip,Juanvulcano/zulip,brainwane/zulip,sonali0901/zulip,dhcrzf/zulip,sonali0901/zulip,sonali0901/zulip,blaze225/zulip,timabbott/zulip,vabs22/zulip,aakash-cr7/zulip,j831/zulip,KingxBanana/zulip,mohsenSy/zulip,verma-varsha/zulip,krtkmj/zulip,sup95/zulip,TigorC/zulip,jrowan/zulip,SmartPeople/zulip,susansls/zulip,punchagan/zulip,JPJPJPOPOP/zulip,PhilSk/zulip,AZtheAsian/zulip,JPJPJPOPOP/zulip,grave-w-grave/zulip,souravbadami/zulip,umkay/zulip,dhcrzf/zulip,umkay/zulip,synicalsyntax/zulip,dawran6/zulip,sonali0901/zulip,souravbadami/zulip,kou/zulip,mahim97/zulip,reyha/zulip,isht3/zulip,Juanvulcano/zulip,ryanbackman/zulip,arpith/zulip,ahmadassaf/zulip,jainayush975/zulip,showell/zulip,jainayush975/zulip,Diptanshu8/zulip,cosmicAsymmetry/zulip,Diptanshu8/zulip,ryanbackman/zulip,calvinleenyc/zulip,amanharitsh123/zulip,niftynei/zulip,zulip/zulip,KingxBanana/zulip,arpith/zulip,SmartPeople/zulip,amanharitsh123/zulip,tommyip/zulip,kou/zulip,sharmaeklavya2/zulip,paxapy/zulip,timabbott/zulip,shubhamdhama/zulip,samatdav/zulip,rishig/zulip,paxapy/zulip,isht3/zulip,grave-w-grave/zulip,AZtheAsian/zulip,jphilipsen05/zulip,hackerkid/zulip,ahmadassaf/zulip,jainayush975/zulip,Galexrt/zulip,jphilipsen05/zulip,SmartPeople/zulip,Galexrt/zulip,jackrzhang/zulip,shubhamdhama/zulip,paxapy/zulip,susansls/zulip,amyliu345/zulip,vabs22/zulip,jrowan/zulip,vaidap/zulip,Juanvulcano/zulip,showell/zulip,reyha/zulip,j831/zulip,Diptanshu8/zulip,hackerkid/zulip,amyliu345/zulip,sup95/zulip,rishig/zulip,peguin40/zulip,dawran6/zulip,zulip/zulip,zacps/zulip,amyliu345/zulip,brainwane/zulip,shubhamdhama/zulip,andersk/zulip,eeshangarg/zulip,dhcrzf/zulip,eeshangarg/zulip,vaidap/zulip,KingxBanana/zulip,jackrzhang/zulip,vaidap/zulip,rishig/zulip,samatdav/zulip,mahim97/zulip,souravbadami/zulip,KingxBanana/zulip,KingxBanana/zulip,synicalsyntax/zulip,AZtheAsian/zulip,punchagan/zulip,brainwane/zulip,reyha/zulip,brockwhittaker/zulip,sup95/zulip,jackrzhang/zulip,blaze225/zulip,dattatreya303/zulip,showell/zulip,vaidap/zulip,christi3k/zulip,reyha/zulip,verma-varsha/zulip,calvinleenyc/zulip,peguin40/zulip,sharmaeklavya2/zulip,susansls/zulip,rishig/zulip