Production environment + deployment strategy + security considerations + server hardening

## Goal
This task has 4 main goals:
- Create all the necessary files (docker-compose, Dockerfile, db scripts, etc... for deployment to production.
- Document the strategy and step by step guideline for deployment to production
- Make a section with specific security considerations
- Make a section for server hardening (Ubuntu server)
- Update the README.md

## Bounty
5.000,- 0L tokens