Remove Celery dependency

website/utils/tasks.py

-from django.utils import timezone
-from thaliawebsite import celery_app
-from django.conf import settings
-
-
-def schedule_task(task, args=(), eta=timezone.now()):
-    if settings.CELERY_ENABLED:
-        result = task.apply_async(args, eta=eta)
-        return result.id
-    return None
-
-
-def revoke_task(task_id):
-    if settings.CELERY_ENABLED:
-        celery_app.control.revoke(task_id)