Improve subscription and add it to admin app

core/admin.py

@@ -1,8 +1,10 @@
 from django.contrib import admin
 from core.models import User, Page, Group
+from django.contrib.auth.models import Group as AuthGroup
 
 
 admin.site.register(User)
+admin.site.unregister(AuthGroup)
 admin.site.register(Group)
 admin.site.register(Page)