Use official fontawesome django app for static file handling
Switch to fork/new version of django-bootstrap (for icon field and rendering shortcuts)
Add migration to bump icon field of dashboard buttons to new version
Update templates to load new app and use new tags

Fix #79

Trying to load the AK list or AK submission page will result in an error message when there are no categories configured yet.
Additionally, the virtual Wishes category is now represented by a real category object instead of an dictionary