Improve performance

[ojongerius]

(Follow up of #54)

This is a broad topic, but things that come to mind at the moment are suggested by Google Pagespeed:

• Avoid landing redirect. Gandi does not allow us to do a CNAME for vol.community so we have a "redirect" -forget the exact Gandi term, to www.vol.community. So options are to use / communicate www.vol.community instead or switch DNS provider.
• Preprocess JS using Grunt or the like, JS files are currently not rendered, which means that, in JS we can't refer to files (examples are other JS, or JSON files with data) served up by Whitenoise.

Preprocessing could be done by https://github.com/fabiocaccamo/django-freeze or tools like Grunt, see this StackOverflow answer https://stackoverflow.com/a/22498224/4372104

/cc @damienklinnert thoughts? If you want to work on this, that would be awesome, but for now I think there are bigger fishes to fry.