Docs link & unique error codes for startup checks
Docs link & unique error codes for startup checks

refs #5821, #6063

- switch out help test to go to a comprehensive doc
- change error codes from 1 to unique codes

cicorias/Ghost,weareleka/blog,handcode7/Ghost,cicorias/Ghost,olsio/Ghost,sebgie/Ghost,javorszky/Ghost,TryGhost/Ghost,klinker-apps/ghost,NovaDevelopGroup/Academy,etanxing/Ghost,NovaDevelopGroup/Academy,vainglori0us/urban-fortnight,BlueHatbRit/Ghost,Smile42RU/Ghost,mohanambati/Ghost,JonSmith/Ghost,sangcu/Ghost,weareleka/blog,Kikobeats/Ghost,dggr/Ghost-sr,augbog/Ghost,tidyui/Ghost,patterncoder/patterncoder,dbalders/Ghost,dqj/Ghost,JonSmith/Ghost,jamesslock/Ghost,PeterCxy/Ghost,ErisDS/Ghost,BlueHatbRit/Ghost,ngosinafrica/SiteForNGOs,bitjson/Ghost,zumobi/Ghost,javorszky/Ghost,JohnONolan/Ghost,mohanambati/Ghost,ignasbernotas/nullifer,sunh3/Ghost,leonli/ghost,chris-yoon90/Ghost,Kaenn/Ghost,jamesslock/Ghost,bosung90/Ghost,hnarayanan/narayanan.co,obsoleted/Ghost,cwonrails/Ghost,dqj/Ghost,ErisDS/Ghost,pollbox/ghostblog,adam-paterson/blog,letsjustfixit/Ghost,leninhasda/Ghost,zumobi/Ghost,Kikobeats/Ghost,GarrethDottin/Habits-Design,obsoleted/Ghost,kevinansfield/Ghost,sunh3/Ghost,mohanambati/Ghost,petersucks/blog,delgermurun/Ghost,Elektro1776/javaPress,veyo-care/Ghost,kaychaks/kaushikc.org,jaswilli/Ghost,duyetdev/islab,benstoltz/Ghost,RufusMbugua/TheoryOfACoder,barbastan/Ghost,kevinansfield/Ghost,bitjson/Ghost,Yarov/yarov,letsjustfixit/Ghost,PeterCxy/Ghost,ashishapy/ghostpy,hnarayanan/narayanan.co,JulienBrks/Ghost,GroupxDev/javaPress,epicmiller/pages,benstoltz/Ghost,stridespace/Ghost,leninhasda/Ghost,epicmiller/pages,vainglori0us/urban-fortnight,chris-yoon90/Ghost,klinker-apps/ghost,novaugust/Ghost,ivantedja/ghost,ngosinafrica/SiteForNGOs,Xibao-Lv/Ghost,janvt/Ghost,GarrethDottin/Habits-Design,ghostchina/Ghost-zh,e10/Ghost,rizkyario/Ghost,STANAPO/Ghost,sangcu/Ghost,bosung90/Ghost,ManRueda/manrueda-blog,Yarov/yarov,TryGhost/Ghost,delgermurun/Ghost,sebgie/Ghost,etanxing/Ghost,ManRueda/manrueda-blog,syaiful6/Ghost,pollbox/ghostblog,janvt/Ghost,mayconxhh/Ghost,daimaqiao/Ghost-Bridge,kevinansfield/Ghost,AlexKVal/Ghost,rizkyario/Ghost,mayconxhh/Ghost,daihuaye/Ghost,daimaqiao/Ghost-Bridge,Elektro1776/javaPress,ErisDS/Ghost,adam-paterson/blog,novaugust/Ghost,cwonrails/Ghost,Gargol/Ghost,ckousik/Ghost,jorgegilmoreira/ghost,karmakaze/Ghost,patterncoder/patterncoder,Kaenn/Ghost,sebgie/Ghost,tidyui/Ghost,dggr/Ghost-sr,handcode7/Ghost,MadeOnMars/Ghost,Xibao-Lv/Ghost,olsio/Ghost,petersucks/blog,syaiful6/Ghost,Kaenn/Ghost,telco2011/Ghost,vainglori0us/urban-fortnight,letsjustfixit/Ghost,stridespace/Ghost,TryGhost/Ghost,lf2941270/Ghost,jorgegilmoreira/ghost,singular78/Ghost,GroupxDev/javaPress,daihuaye/Ghost,rizkyario/Ghost,acburdine/Ghost,leonli/ghost,dbalders/Ghost,telco2011/Ghost,ignasbernotas/nullifer,daimaqiao/Ghost-Bridge,JulienBrks/Ghost,AlexKVal/Ghost,anijap/PhotoGhost,jaswilli/Ghost,disordinary/Ghost,Elektro1776/javaPress,augbog/Ghost,novaugust/Ghost,ckousik/Ghost,GroupxDev/javaPress,ghostchina/Ghost-zh,singular78/Ghost,Gargol/Ghost,NovaDevelopGroup/Academy,Trendy/Ghost,chevex/undoctrinate,acburdine/Ghost,singular78/Ghost,lukekhamilton/Ghost,dbalders/Ghost,acburdine/Ghost,Kikobeats/Ghost,JohnONolan/Ghost,dggr/Ghost-sr,e10/Ghost,kaychaks/kaushikc.org,ballPointPenguin/Ghost,ballPointPenguin/Ghost,veyo-care/Ghost,Trendy/Ghost,karmakaze/Ghost,lukekhamilton/Ghost,leonli/ghost,ManRueda/manrueda-blog,Smile42RU/Ghost,ashishapy/ghostpy,jorgegilmoreira/ghost,SkynetInc/steam,lf2941270/Ghost,JohnONolan/Ghost,duyetdev/islab,anijap/PhotoGhost,MadeOnMars/Ghost,disordinary/Ghost,stridespace/Ghost,jomahoney/Ghost,STANAPO/Ghost,telco2011/Ghost,cwonrails/Ghost,barbastan/Ghost,RufusMbugua/TheoryOfACoder,SkynetInc/steam,jomahoney/Ghost