Update docs with beta-status; improved intro text.
Update docs with beta-status; improved intro text.

ddevlin/GitSavvy,jmanuel1/GitSavvy,ddevlin/GitSavvy,asfaltboy/GitSavvy,jmanuel1/GitSavvy,ralic/GitSavvy,asfaltboy/GitSavvy,theiviaxx/GitSavvy,dreki/GitSavvy,stoivo/GitSavvy,theiviaxx/GitSavvy,divmain/GitSavvy,ypersyntelykos/GitSavvy,divmain/GitSavvy,stoivo/GitSavvy,ddevlin/GitSavvy,asfaltboy/GitSavvy,ralic/GitSavvy,dvcrn/GitSavvy,stoivo/GitSavvy,ypersyntelykos/GitSavvy,dreki/GitSavvy,dvcrn/GitSavvy,divmain/GitSavvy