Productionize frontend and backend

As system administrator, I'd like to have a sane way of running API server and frontend UI. This currently requires manually setting up unit files for backend service and some magic to host frontend.

For frontend:

1. Documentation for building / downloading package for a specified version
1. Documentation for configuring Nginx frontend
1. Performance tuning for frontend (e.g. minified versions of JSes)

For backend:

1. Configuration for Nginx/WSGI
1. Documentation for configuring Nginx backend server
1. Performance tuning for backend (e.g. parameters for WSGI)

For Nginx LB:

1. systemd unit file for Nginx
1. Documentation for setting up URLs, domains, possibly exposing outside with SSL