docs(README): add modal to index-nocss list
docs(README): add modal to index-nocss list

Closes #6005

shootermv/bootstrap,looker/bootstrap,fpipita/bootstrap,RobJacobs/bootstrap,Kpler/bootstrap,angular-ui/bootstrap,caoruiy/bootstrap,byronigoe/bootstrap,icfantv/bootstrap,vfiles/bootstrap,BookingBug/bootstrap,Kpler/bootstrap,icfantv/bootstrap,angular-ui/bootstrap,BookingBug/bootstrap,caoruiy/bootstrap,Servoy/bootstrap,shootermv/bootstrap,byronigoe/bootstrap,looker/bootstrap,RobJacobs/bootstrap,vfiles/bootstrap,fpipita/bootstrap,Servoy/bootstrap