Migrate to new UI template

Ghost User
2018-10-18T13:38:35+02:00

Bootstrap 4, FontAwesome 4, jQuery 3, FullCalendar 3 etc etc.
Much awesome.

Done:
- [x] activemembers
- [x] announcements (still needs removal of old template)
- [x] documents
- [x] education (remove shortnames using migration)
- [x] events
- [x] members
- [x] merchandise
- [x] partners (still needs removal of code when removing old template)
- [x] photos
- [x] pizzas
- [x] registrations
- [x] templates
- [x] thabloid
- [x] thaliawebsite