Remove intersphinx from the docs build as it triggers network calls that
occasionally fail, and we don't really use intersphinx (links other
sphinx documents out on the internet)
This also removes the requirement for internet access during docs build.
This can cause docs jobs to fail if the project errors out on
warnings.
Change-Id: I71e941e2a639641a662a163c682eb86d51de42fb
Related-Bug: #1368910
The current developer docs theme used is out of sync with the other
openstack projects. This patch will update the docs to provide a more
consistent look and feel when using developer docs
Change-Id: I03985039381c2ba4f81a2015258f7b49bba441d9
