Update of the app settings
I updated several things:
- the allowed host in order to run the website in production mode.
- I added the compressor application to the list of available apps
- setup the `STATIC_ROOT` to give the compressor library the path where
are stored both the css and javascript files
- I setup the compressor library to be used at runtime
- I setup the preprocessor for the scss files
Signed-off-by:
Matthieu Berjon <matthieu.berjon@inria.fr>