Remove some Framaboard customizations

- css customization, caroussel container and is_ldap_user input hiding
  are moved to the plugin
- User*Controller links hiding doesn't seem useful anymore

See Framaboard@4c422df4
See Framaboard@5503ca4c
See Framaboard@b981f333
2 jobs for remove-some-framaboard-customization in 3 minutes and 45 seconds (queued for 1 second)
Status Job ID Name Coverage
  Deploy
passed #521594
pages

00:03:45

passed pages:deploy

00:00:01