Update documentation to newest version

[raae]

Describe how to get started with the project, so Bouvet or others easily can step in.

• [ ] Check out repo and start from scratch and document the process.
• [ ] Describe important design choices
• [x] Put all important keys etc. in private repo or 1password

[raae]

Added all snippets need for production in varsom-secrets

[raae]

Postpone describing important design choices until move is decided.