This part should describe:
- the complete feature list/compatibility matrix
- the complete format/codec list/compatibility matrix
- the complete description of all VLC modules and filters

This part of the documentation is meant to gather "non basic" usecases.

This section is meant to gather the most common usages of VLC.

- move VLC description in a `about vlc` page
- use containers for sections and add some illustrations

About page includes license and contribute sections

Convention is now:
If you include a picture in `/<path>/<file>.rst`, your picture must
follow the path: `images/<path>/<file>_<some_title>.<extension>`.

For example: if you want to include the picture `mypicture.png` in
`/a/cool/path/myguide.rst`, move your picture file to `/a/cool/path/myguide_mypicture.png`.