feat: add location deduplication

src/fellchensammlung/management/commands/dedup_locations.py

@@ -0,0 +1,10 @@
+from django.core.management import BaseCommand
+from fellchensammlung.tools.admin import dedup_locations
+
+
+class Command(BaseCommand):
+    help = 'Deduplicate locations based on place_id'
+
+    def handle(self, *args, **options):
+        dedup_locations()
+