Shout out to Nick Econopouly (wrycode) for earlier working demo[1] of
porting the docs from GitLab wiki to Sphinx, which I expect will be
invaluable as we go forward with gradually porting increasingly more
parts of the docs to Sphinx.

[1] https://git.wrycode.com/wrycode/jami-docs/log.html

Change-Id: I5cd7c8142e9639a90df76da887c0f8481e3db405