The repo used both openstackdocstheme and oslosphinx in requirements but
then configured openstackdocstheme, remove oslosphinx everywhere.
Instead of using sphinx-build, use docstheme-build-translated.sh to
build English and translated documents.
Update doc/source/conf.py for newer openstackdocstheme and require
a new enough version.
Remove module index - it does not exist, this is not a python repo where
autodoc works.
Remove sphinx-quickstart generated output from index.rst, it's not
needed anymore.
Change-Id: Ib3f09128226f0bcc78384b1ee2da811d62a5b59d
1d5dfa2468