Sahara projects migrated to storyboard.openstack.org.
Replace the references to Launchpad, including the rename of
a documentation page focuse on launchpad (which would
probably require a redirect on the openstack.org site),
and clean up some old details about blueprints.
Fix the bug links in the openstackdocstheme configuration.
Change-Id: I30642356f1b1076a874f14fc43fad234fa9a098d
(cherry picked from commit 3734ef7f5e)
5e987cf611