This patch enables Firstapp documentation to use the log-a-bug
feature of openstackdocstheme, which was previously only working
with OpenStack manuals.
The relevant code is in script_footer.html and is extensively
documented.
In order to allow testing, I added part of the api-site tree
to the openstackdocstheme repo.
Change-Id: Ic5e8dd6733f26a5be00b242a3d3203debb19e8c2