Remove url_title fields from Image and Album.
Change `get_absolute_url` methods to point to PK.
Update serializers and API views with new URLs.
Make image blocks `display: block` to allow them to be other element types.
Remove un-needed angular-cookies.js file (we use the CDN version)
Remove auth templates, using DRF templates instead.
Rework the Angular application to take into account the API changes.