Don't allow to customize ALLOWED_HOSTS for local dev

We have several instances of hardcoded hosts which doesn't allow dynamic configuration

Author: ulgens

djangoproject/settings/dev.py

@@ -5,7 +5,7 @@
     "djangoproject.localhost",
     "docs.djangoproject.localhost",
     "dashboard.djangoproject.localhost",
-] + SECRETS.get("allowed_hosts", [])
+]
 
 LOCALE_MIDDLEWARE_EXCLUDED_HOSTS = ["docs.djangoproject.localhost"]