Add /add page and cli.py for updating feeds

manage.py

@@ -1,20 +0,0 @@
-#!/usr/bin/env python
-"""Django's command-line utility for administrative tasks."""
-
-import os
-import sys
-
-
-def main() -> None:
-    """Run administrative tasks."""
-    os.environ.setdefault(key="DJANGO_SETTINGS_MODULE", value="feedvault.settings")
-    try:
-        from django.core.management import execute_from_command_line  # noqa: PLC0415
-    except ImportError as exc:
-        msg = "Couldn't import Django. Have you run `poetry install` or `poetry shell`?"
-        raise ImportError(msg) from exc
-    execute_from_command_line(sys.argv)
-
-
-if __name__ == "__main__":
-    main()