Remove mention of git.fabfile.org from docs
Remove mention of git.fabfile.org from docs

tekapo/fabric,amaniak/fabric,elijah513/fabric,cgvarela/fabric,kxxoling/fabric,qinrong/fabric,rane-hs/fabric-py3,bspink/fabric,cmattoon/fabric,MjAbuz/fabric,bitprophet/fabric,jaraco/fabric,rodrigc/fabric,raimon49/fabric,TarasRudnyk/fabric,xLegoz/fabric,rbramwell/fabric,StackStorm/fabric,likesxuqiang/fabric,kmonsoor/fabric,haridsv/fabric,pashinin/fabric,getsentry/fabric,itoed/fabric,sdelements/fabric,pgroudas/fabric,ploxiln/fabric,hrubi/fabric,bitmonk/fabric,opavader/fabric,askulkarni2/fabric,SamuelMarks/fabric,fernandezcuesta/fabric,mathiasertl/fabric,tolbkni/fabric