Satisfy 12 Factor App Criteria

[valentinajemuovic]

Refactor the application to ensure it satisfies the 12 Factors https://12factor.net/

I've copied them below as a checklist:

• [ ] I. Codebase
• [ ] II. Dependencies
• [ ] III. Config
• [ ] IV. Backing services
• [ ] V. Build, release, run
• [ ] VI. Processes
• [ ] VII. Port binding
• [ ] VIII. Concurrency
• [ ] IX. Disposability
• [ ] X. Dev/prod parity
• [ ] XI. Logs
• [ ] XII. Admin processes