More migration guide updates
More migration guide updates

- Rename "Finishing Up" to "Nginx configuration"
- Add fourth "Finishing Up" section
- Add Troubleshooting section with a link to backup restoration docs
- Change a few indented blocks into fenced blocks so they're highlighted
  properly.
- Added Marin's suggestions for CI-to-CE-on-different-server section.

dplarson/gitlabhq,Tyrael/gitlabhq,SVArago/gitlabhq,koreamic/gitlabhq,daiyu/gitlab-zh,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,larryli/gitlabhq,aaronsnyder/gitlabhq,yfaizal/gitlabhq,LUMC/gitlabhq,sonalkr132/gitlabhq,MauriceMohlek/gitlabhq,yfaizal/gitlabhq,ksoichiro/gitlabhq,htve/GitlabForChinese,Devin001/gitlabhq,martijnvermaat/gitlabhq,NKMR6194/gitlabhq,louahola/gitlabhq,ikappas/gitlabhq,chenrui2014/gitlabhq,salipro4ever/gitlabhq,jirutka/gitlabhq,fantasywind/gitlabhq,jrjang/gitlab-ce,fscherwi/gitlabhq,koreamic/gitlabhq,szechyjs/gitlabhq,icedwater/gitlabhq,jrjang/gitlabhq,jrjang/gitlab-ce,ferdinandrosario/gitlabhq,jirutka/gitlabhq,MauriceMohlek/gitlabhq,fantasywind/gitlabhq,louahola/gitlabhq,fscherwi/gitlabhq,jrjang/gitlabhq,dplarson/gitlabhq,sue445/gitlabhq,jrjang/gitlabhq,mmkassem/gitlabhq,darkrasid/gitlabhq,duduribeiro/gitlabhq,aaronsnyder/gitlabhq,copystudy/gitlabhq,t-zuehlsdorff/gitlabhq,mrb/gitlabhq,icedwater/gitlabhq,ksoichiro/gitlabhq,MauriceMohlek/gitlabhq,axilleas/gitlabhq,copystudy/gitlabhq,jirutka/gitlabhq,fpgentil/gitlabhq,martijnvermaat/gitlabhq,icedwater/gitlabhq,dreampet/gitlab,daiyu/gitlab-zh,Devin001/gitlabhq,ksoichiro/gitlabhq,axilleas/gitlabhq,htve/GitlabForChinese,yatish27/gitlabhq,mr-dxdy/gitlabhq,mmkassem/gitlabhq,screenpages/gitlabhq,chenrui2014/gitlabhq,mr-dxdy/gitlabhq,icedwater/gitlabhq,salipro4ever/gitlabhq,sonalkr132/gitlabhq,gopeter/gitlabhq,Telekom-PD/gitlabhq,MauriceMohlek/gitlabhq,Datacom/gitlabhq,LUMC/gitlabhq,martijnvermaat/gitlabhq,iiet/iiet-git,sonalkr132/gitlabhq,yatish27/gitlabhq,yatish27/gitlabhq,szechyjs/gitlabhq,szechyjs/gitlabhq,chenrui2014/gitlabhq,daiyu/gitlab-zh,dwrensha/gitlabhq,dreampet/gitlab,sue445/gitlabhq,ferdinandrosario/gitlabhq,joalmeid/gitlabhq,yfaizal/gitlabhq,LUMC/gitlabhq,allysonbarros/gitlabhq,dwrensha/gitlabhq,koreamic/gitlabhq,Tyrael/gitlabhq,Telekom-PD/gitlabhq,iiet/iiet-git,htve/GitlabForChinese,fantasywind/gitlabhq,Tyrael/gitlabhq,darkrasid/gitlabhq,openwide-java/gitlabhq,dwrensha/gitlabhq,Datacom/gitlabhq,stoplightio/gitlabhq,fscherwi/gitlabhq,joalmeid/gitlabhq,salipro4ever/gitlabhq,salipro4ever/gitlabhq,ikappas/gitlabhq,dplarson/gitlabhq,Datacom/gitlabhq,cui-liqiang/gitlab-ce,shinexiao/gitlabhq,jrjang/gitlabhq,ikappas/gitlabhq,t-zuehlsdorff/gitlabhq,larryli/gitlabhq,jrjang/gitlab-ce,ttasanen/gitlabhq,screenpages/gitlabhq,fpgentil/gitlabhq,NKMR6194/gitlabhq,htve/GitlabForChinese,openwide-java/gitlabhq,mmkassem/gitlabhq,dplarson/gitlabhq,Tyrael/gitlabhq,gopeter/gitlabhq,mmkassem/gitlabhq,fantasywind/gitlabhq,dreampet/gitlab,louahola/gitlabhq,larryli/gitlabhq,jrjang/gitlab-ce,aaronsnyder/gitlabhq,gopeter/gitlabhq,iiet/iiet-git,cui-liqiang/gitlab-ce,szechyjs/gitlabhq,joalmeid/gitlabhq,mrb/gitlabhq,stoplightio/gitlabhq,mrb/gitlabhq,mr-dxdy/gitlabhq,ksoichiro/gitlabhq,ttasanen/gitlabhq,shinexiao/gitlabhq,SVArago/gitlabhq,stoplightio/gitlabhq,screenpages/gitlabhq,iiet/iiet-git,openwide-java/gitlabhq,koreamic/gitlabhq,larryli/gitlabhq,Soullivaneuh/gitlabhq,allysonbarros/gitlabhq,dreampet/gitlab,NKMR6194/gitlabhq,fpgentil/gitlabhq,yatish27/gitlabhq,mr-dxdy/gitlabhq,Telekom-PD/gitlabhq,Devin001/gitlabhq,Soullivaneuh/gitlabhq,aaronsnyder/gitlabhq,cui-liqiang/gitlab-ce,sue445/gitlabhq,Soullivaneuh/gitlabhq,dwrensha/gitlabhq,allysonbarros/gitlabhq,gopeter/gitlabhq,joalmeid/gitlabhq,ikappas/gitlabhq,screenpages/gitlabhq,axilleas/gitlabhq,mrb/gitlabhq,cui-liqiang/gitlab-ce,copystudy/gitlabhq,ttasanen/gitlabhq,SVArago/gitlabhq,ferdinandrosario/gitlabhq,fscherwi/gitlabhq,duduribeiro/gitlabhq,duduribeiro/gitlabhq,darkrasid/gitlabhq,martijnvermaat/gitlabhq,NKMR6194/gitlabhq,LUMC/gitlabhq,ferdinandrosario/gitlabhq,louahola/gitlabhq,Devin001/gitlabhq,Telekom-PD/gitlabhq,sue445/gitlabhq,duduribeiro/gitlabhq,yfaizal/gitlabhq,shinexiao/gitlabhq,stoplightio/gitlabhq,fpgentil/gitlabhq,sonalkr132/gitlabhq,ttasanen/gitlabhq,daiyu/gitlab-zh,darkrasid/gitlabhq,copystudy/gitlabhq,Soullivaneuh/gitlabhq,t-zuehlsdorff/gitlabhq,chenrui2014/gitlabhq,openwide-java/gitlabhq,allysonbarros/gitlabhq,SVArago/gitlabhq,shinexiao/gitlabhq,Datacom/gitlabhq