- Move Simon's architecture documentation into architecture/
(setup, variables, topology, dns, deploy, security, operations
plus index and glossary). All cross-repo references point at
https://git.digitalboard.ch/Digitalboard/{reference-ansible,dns-zones}
via absolute URLs so the docs remain navigable from any context.
- Rewrite README.md as a documentation hub: introduction, platform
Mermaid overview, comparison of the three repos
(docs / digitalboard.core / reference-ansible) and a full table of
contents covering architecture, contributing, infrastructure,
keycloak, ms-entra and troubleshooting.
Addresses the open items from the WKS PoC review (2026-05-26):
docs README begrüssungstext + Übersichtsgrafik + Verlinkung der
beiden anderen Repos, sowie das Verschieben der Architektur-Doku.
