Python requirements and Docker version upgrades (#826)

v3.0.0: Python, Django, Celery and other version upgrades

files/urls.py

@@ -1,7 +1,7 @@
 from django.conf import settings
-from django.conf.urls import include, re_path
+from django.conf.urls import include
 from django.conf.urls.static import static
-from django.urls import path
+from django.urls import path, re_path
 
 from . import management_views, views
 from .feeds import IndexRSSFeed, SearchRSSFeed