Removed UserRestrictedModule & tweaked CAS setting

* Removed UserRestrictedModule (and associated models) from the project as it wasn't used (or will not be used)
* Change the settings to make sure the admin of the site is also behind the CAS in production

Fixes #81
9 jobs for master in 3 minutes and 11 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Check
passed #510838
docker
check_back

00:00:17

passed #510839
docker
check_front

00:00:48

 
  Test
passed #510840
docker
test_back

00:00:49

96.0%
passed #510841
docker
test_frontend

00:00:16

 
  Lint
passed #510843
docker
eslint

00:00:21

passed #510842
docker
flake8

00:00:13

 
  Svg Gen Docu
passed #510844
docker
generate_UML_svg

00:00:13

 
  Documentation
passed #510845
docker
pages

00:00:11

 
  Deploy
passed pages:deploy

00:00:00