Refactor Docker and Django configuration

- Update Dockerfile to use Python 3.11-slim and optimize build steps
- Remove Dockerfile.prod and update docker-compose.yml
- Remove entrypoint.sh and twilio dependency
- Modify Django settings for production security and configuration
- Update user serializer to include group permissions
- Enhance CSRF and SSL configuration settings

docker-compose.yml

@@ -2,7 +2,6 @@ services:
   api:
     build:
       context: .
-      dockerfile: Dockerfile.prod
     restart: always
     command: gunicorn apibase.wsgi:application --bind 0.0.0.0:5000 --workers=2
     volumes: