README is missing some 'prod' setup steps

[Lordfirespeed]

The README does not mention some steps required to setup this project for 'production' environments.
The necessary steps should be outlined and appropriate materials referenced.
Steps that are particularly specific to this project should be described in detail.

• Installation & configuration of PostgreSQL
• Installation of uWSGI
• Configuration of the uWSGI 'Emperor'
• Installation of nginx
• Configuration of nginx (refer to ducompsoc/durhack-nginx)
• Setting up the Python virtual environment
• Defining the systemd service responsible for the queue workers
• Enabling and starting the service