Added ignore for documentation build folder.
Added ignore for documentation build folder.

--HG--
branch : experimental

kynikos/qtile,himaaaatti/qtile,encukou/qtile,aniruddhkanojia/qtile,EndPointCorp/qtile,kseistrup/qtile,tych0/qtile,EndPointCorp/qtile,apinsard/qtile,rxcomm/qtile,w1ndy/qtile,zordsdavini/qtile,dequis/qtile,de-vri-es/qtile,soulchainer/qtile,jdowner/qtile,xplv/qtile,flacjacket/qtile,apinsard/qtile,encukou/qtile,xplv/qtile,andrewyoung1991/qtile,qtile/qtile,himaaaatti/qtile,kseistrup/qtile,soulchainer/qtile,StephenBarnes/qtile,cortesi/qtile,qtile/qtile,nxnfufunezn/qtile,kiniou/qtile,flacjacket/qtile,ramnes/qtile,zordsdavini/qtile,de-vri-es/qtile,tych0/qtile,frostidaho/qtile,farebord/qtile,StephenBarnes/qtile,farebord/qtile,cortesi/qtile,kynikos/qtile,ramnes/qtile,w1ndy/qtile,rxcomm/qtile,kopchik/qtile,dequis/qtile,frostidaho/qtile,andrewyoung1991/qtile,kiniou/qtile,aniruddhkanojia/qtile,kopchik/qtile,nxnfufunezn/qtile,jdowner/qtile