Reference architectures for prod environments

[Stezido]

Description 😯

The architecture documentation of Trubudget is old. The docs should show two prod reference architecture, one modern, one legacy. This docs should describe which techs can be used. There should also be an example concept how to deal with secrets in this ref environment. Other topics:

• monitoring
• logging
• Deal with Updates
• Deal with backups
• ....

[Stezido]

Create a doc for docker-compose setup and for kubernetes cluster (modern) setup

Architecture sections:

• general
• monitoring
• logging
• Deal with Updates
• Deal with backups
• Release management
• SSL Enablement (how to get certificates aso.)