removed superuser envs from celery

docker-compose.yaml

@@ -22,10 +22,6 @@ services:
       - POSTGRES_DB=misago
       - POSTGRES_HOST=postgres
       - POSTGRES_TEST_DB=misago_test
-      # Superuser
-      - SUPERUSER_USERNAME=Admin
-      - SUPERUSER_EMAIL=admin@example.com
-      - SUPERUSER_PASSWORD=password
     ports:
       # Map port 8000 in the container to port 8000 on the host
       # This way we can access the forum through http://localhost:8000