- removed env.production and added a env.example that should be renamed to `.env` (not tracked by default)
- Refactored docker-compose.yml
* adding user to django, celeryworker, celerybeat so that we got rid of the `su` hack
* removed rabbitmq
- Refactored Dockerfile
- Refactored `entrypoint.sh` and added inline documentation
- Removed `su` hack from gunicorn.sh
- Added documentation