Remove useless installed apps

aleksis/apps/ticdesk/settings.py

@@ -46,24 +46,14 @@ DISALLOWED_UIDS = [
 DISALLOWED_LOCAL_PARTS = DISALLOWED_UIDS + ['webmaster', 'hostmaster', 'postmaster']
 
 INSTALLED_APPS = [
-    'bootstrap4',
-    'fa',
-    'ticdesk',
     'ticdesk_account.apps.TicdeskAccountConfig',
     'ticdesk_org.apps.TicdeskOrgConfig',
     'ticdesk_events.apps.TicdeskEventsConfig',
     'django_extensions',
-    'django.contrib.admin',
-    'django.contrib.auth',
-    'django.contrib.contenttypes',
-    'django.contrib.sessions',
-    'django.contrib.messages',
-    'django.contrib.staticfiles',
     'django_starfield',
     'django_filters',
     'django_tables2',
     'django_cron',
-    'maintenance_mode',
     'leaflet',
 ]