Update customizing docs, css was replaced by .less
Update customizing docs, css was replaced by .less

Docs still refer to style.css, but we're using horizon.less
for ages now. The docs should reflect that. The size of the logo
changed as well.

Change-Id: Ib4fc0624cc71e226895c7cef1567948d7f82d277

eayunstack/horizon,davidcusatis/horizon,orbitfp7/horizon,henaras/horizon,sandvine/horizon,CiscoSystems/horizon,vladryk/horizon,Metaswitch/horizon,bigswitch/horizon,wolverineav/horizon,flochaz/horizon,Solinea/horizon,mrunge/openstack_horizon,Solinea/horizon,mrunge/openstack_horizon,mrunge/horizon_lib,froyobin/horizon,maestro-hybrid-cloud/horizon,philoniare/horizon,j4/horizon,dan1/horizon-x509,karthik-suresh/horizon,Tesora/tesora-horizon,JioCloud/horizon,kfox1111/horizon,karthik-suresh/horizon,promptworks/horizon,Dark-Hacker/horizon,aaronorosen/horizon-congress,coreycb/horizon,CiscoSystems/avos,yeming233/horizon,flochaz/horizon,dan1/horizon-x509,promptworks/horizon,saydulk/horizon,anthonydillon/horizon,tsufiev/horizon,Hodorable/0602,NCI-Cloud/horizon,damien-dg/horizon,tqtran7/horizon,tqtran7/horizon,pranavtendolkr/horizon,openstack/horizon,Hodorable/0602,BiznetGIO/horizon,tsufiev/horizon,nvoron23/avos,mrunge/horizon_lib,RudoCris/horizon,kfox1111/horizon,karthik-suresh/horizon,icloudrnd/automation_tools,coreycb/horizon,bigswitch/horizon,CiscoSystems/avos,endorphinl/horizon,maestro-hybrid-cloud/horizon,davidcusatis/horizon,j4/horizon,xinwu/horizon,django-leonardo/horizon,damien-dg/horizon,noironetworks/horizon,dan1/horizon-proto,watonyweng/horizon,Metaswitch/horizon,newrocknj/horizon,BiznetGIO/horizon,VaneCloud/horizon,vladryk/horizon,pranavtendolkr/horizon,mrunge/openstack_horizon,wangxiangyu/horizon,philoniare/horizon,mdavid/horizon,tqtran7/horizon,redhat-cip/horizon,watonyweng/horizon,JioCloud/horizon,gerrive/horizon,doug-fish/horizon,takeshineshiro/horizon,froyobin/horizon,mdavid/horizon,davidcusatis/horizon,nvoron23/avos,Mirantis/mos-horizon,tellesnobrega/horizon,sandvine/horizon,FNST-OpenStack/horizon,tellesnobrega/horizon,bigswitch/horizon,Mirantis/mos-horizon,NeCTAR-RC/horizon,wangxiangyu/horizon,mandeepdhami/horizon,saydulk/horizon,agileblaze/OpenStackTwoFactorAuthentication,RudoCris/horizon,yjxtogo/horizon,doug-fish/horizon,ChameleonCloud/horizon,Hodorable/0602,anthonydillon/horizon,endorphinl/horizon,dan1/horizon-x509,ging/horizon,django-leonardo/horizon,mandeepdhami/horizon,blueboxgroup/horizon,j4/horizon,watonyweng/horizon,karthik-suresh/horizon,vladryk/horizon,Mirantis/mos-horizon,takeshineshiro/horizon,Daniex/horizon,NCI-Cloud/horizon,liyitest/rr,dan1/horizon-proto,endorphinl/horizon-fork,openstack/horizon,NeCTAR-RC/horizon,ChameleonCloud/horizon,xme1226/horizon,newrocknj/horizon,django-leonardo/horizon,mrunge/horizon,maestro-hybrid-cloud/horizon,doug-fish/horizon,sandvine/horizon,redhat-openstack/horizon,VaneCloud/horizon,ChameleonCloud/horizon,agileblaze/OpenStackTwoFactorAuthentication,wangxiangyu/horizon,takeshineshiro/horizon,orbitfp7/horizon,mdavid/horizon,j4/horizon,Dark-Hacker/horizon,endorphinl/horizon,agileblaze/OpenStackTwoFactorAuthentication,icloudrnd/automation_tools,henaras/horizon,mandeepdhami/horizon,kfox1111/horizon,JioCloud/horizon,liyitest/rr,liyitest/rr,idjaw/horizon,tellesnobrega/horizon,damien-dg/horizon,kfox1111/horizon,bac/horizon,henaras/horizon,FNST-OpenStack/horizon,VaneCloud/horizon,Hodorable/0602,noironetworks/horizon,aaronorosen/horizon-congress,yeming233/horizon,nvoron23/avos,luhanhan/horizon,openstack/horizon,coreycb/horizon,Tesora/tesora-horizon,davidcusatis/horizon,flochaz/horizon,pranavtendolkr/horizon,luhanhan/horizon,Dark-Hacker/horizon,henaras/horizon,pranavtendolkr/horizon,maestro-hybrid-cloud/horizon,wangxiangyu/horizon,ChameleonCloud/horizon,Tesora/tesora-horizon,zouyapeng/horizon,xme1226/horizon,aaronorosen/horizon-congress,FNST-OpenStack/horizon,yjxtogo/horizon,bac/horizon,izadorozhna/dashboard_integration_tests,endorphinl/horizon,xinwu/horizon,luhanhan/horizon,Daniex/horizon,xinwu/horizon,redhat-cip/horizon,dan1/horizon-proto,VaneCloud/horizon,idjaw/horizon,mandeepdhami/horizon,yeming233/horizon,icloudrnd/automation_tools,endorphinl/horizon-fork,tsufiev/horizon,idjaw/horizon,blueboxgroup/horizon,BiznetGIO/horizon,Solinea/horizon,noironetworks/horizon,nvoron23/avos,promptworks/horizon,watonyweng/horizon,wolverineav/horizon,yjxtogo/horizon,Dark-Hacker/horizon,CiscoSystems/horizon,gerrive/horizon,CiscoSystems/avos,ging/horizon,blueboxgroup/horizon,tsufiev/horizon,idjaw/horizon,redhat-cip/horizon,Metaswitch/horizon,eayunstack/horizon,saydulk/horizon,eayunstack/horizon,gerrive/horizon,orbitfp7/horizon,NCI-Cloud/horizon,dan1/horizon-proto,newrocknj/horizon,CiscoSystems/avos,yjxtogo/horizon,promptworks/horizon,RudoCris/horizon,newrocknj/horizon,xme1226/horizon,NeCTAR-RC/horizon,agileblaze/OpenStackTwoFactorAuthentication,takeshineshiro/horizon,Daniex/horizon,xinwu/horizon,redhat-openstack/horizon,tqtran7/horizon,saydulk/horizon,anthonydillon/horizon,Solinea/horizon,BiznetGIO/horizon,gerrive/horizon,coreycb/horizon,NCI-Cloud/horizon,Mirantis/mos-horizon,bac/horizon,doug-fish/horizon,wolverineav/horizon,Metaswitch/horizon,tellesnobrega/horizon,RudoCris/horizon,mrunge/horizon_lib,zouyapeng/horizon,yeming233/horizon,endorphinl/horizon-fork,damien-dg/horizon,redhat-cip/horizon,redhat-openstack/horizon,NeCTAR-RC/horizon,bigswitch/horizon,CiscoSystems/horizon,orbitfp7/horizon,zouyapeng/horizon,froyobin/horizon,blueboxgroup/horizon,izadorozhna/dashboard_integration_tests,liyitest/rr,sandvine/horizon,django-leonardo/horizon,noironetworks/horizon,philoniare/horizon,mrunge/horizon,FNST-OpenStack/horizon,dan1/horizon-x509,flochaz/horizon,zouyapeng/horizon,endorphinl/horizon-fork,vladryk/horizon,philoniare/horizon,mrunge/horizon,Tesora/tesora-horizon,icloudrnd/automation_tools,redhat-openstack/horizon,CiscoSystems/horizon,mdavid/horizon,anthonydillon/horizon,bac/horizon,ging/horizon,Daniex/horizon,ging/horizon,luhanhan/horizon,openstack/horizon,wolverineav/horizon