oslosphinx is the old hotness. openstackdocstheme is the new hotness.
Also, we can use doc/requirements.txt for docs requirements.
Change-Id: I9cbc670c8fb065d240251f061919479c87193ff5
Split up the README into separate documentation files so we can publish
the documentation for git-review.
Change-Id: Idcdf43e73c5ca5b8cb239606236e3b2a660c46b7