Remove obsolete code

aleksis/apps/alsijil/schema/documentation.py

@@ -36,14 +36,6 @@ class DocumentationCreateMutation(DjangoCreateMutation):
         optional_fields = ("course", "lesson_event", "subject", "topic", "homework", "group_note", "datetime_start", "datetime_end", "date_start", "date_end")
         permissions = ("alsijil.add_documentation",)  # FIXME
 
-    @classmethod
-    def before_mutate(cls, root, info, input):
-        if "year" in input and "calendarWeek" in input:
-            cw = CalendarWeek(year=input["year"], week=input["week"])
-            input["date_start"] = cw[0]
-            input["date_end"] = cw[6]
-        return input
-
 
 class DocumentationBatchCreateMutation(DjangoBatchCreateMutation):
     class Meta: