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
7 jobs for !105 with remove/userRestrictedModule in 7 minutes and 24 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Check
passed #510831
docker
check_back

00:00:47

passed #510832
docker
check_front

00:04:07

 
  Test
passed #510833
docker
test_back

00:01:13

96.0%
passed #510834
docker
test_frontend

00:00:19

 
  Lint
passed #510836
docker
eslint

00:00:22

passed #510835
docker
flake8

00:00:13

 
  Svg Gen Docu
passed #510837
docker
generate_UML_svg

00:00:18