We must organize the doc

I think individual package reference documentation should be inside the package git repository. It would ease the development task of updating the documentation together with code changes.

So pages like this

http://docs.nethserver.org/projects/nethserver-devel/en/latest/ups.html

I think they should be moved into README files, like this (old experiment)

https://github.com/NethServer/nethserver-sogo/blob/master/README.rst