Merge branch 'feature/use-sphinx-doc' into 'master'

Feature/use sphinx doc

See merge request !2
1 job for master in 31 seconds (queued for 2 seconds)
Name Stage Failure
pages Test
Exception occurred:
File "/usr/lib/python2.7/site-packages/recommonmark/", line 211, in visit_image
img_node['alt'] = ''.join(content)
TypeError: sequence item 1: expected string or Unicode, NoneType found
The full traceback has been saved in /tmp/sphinx-err-OprVST.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <>. Thanks!
make: *** [Makefile:59: html] Error 2
ERROR: Job failed: exit code 2