Remove link to Django admin.

biscuit/core/menus.py

@@ -9,7 +9,3 @@ Menu.add_item('main', MenuItem('Login',
 Menu.add_item('main', MenuItem('Logout',
                                reverse('logout'),
                                check=lambda request: request.user.is_authenticated))
-
-Menu.add_item('main', MenuItem('Admin',
-                               reverse('admin:index'),
-                               check=lambda request: request.user.is_authenticated and request.user.is_superuser))