Remove unused menus.py file

CHANGELOG.rst

@@ -21,6 +21,10 @@ Fixed
 * Exam import failed sometimes when data provided through Untis were incomplete.
 * Importer now automatically fixes intersections of terms with previous terms.
 
+Removed
+~~~~~~~
+* Remove remaining data management menu entry.
+
 `2.3.2`_ - 2022-09-01
 ---------------------
 

aleksis/apps/untis/menus.py

-from django.utils.translation import gettext_lazy as _
-
-MENUS = {
-    "DATA_MANAGEMENT_MENU": [
-        {
-            "name": _("Link subjects to groups (for Untis MySQL import)"),
-            "url": "untis_groups_subjects",
-            "validators": [
-                (
-                    "aleksis.core.util.predicates.permission_validator",
-                    "untis.assign_subjects_to_groups_rule",
-                ),
-            ],
-        },
-    ]
-}