- docs/felhasznaloi-utmutato.md: user guide for the website and the CMS
(login, editing, arrays, save/validation, publish, security)
- /guide endpoint renders the markdown auth-protected via a dependency-free
renderer (scripts/markdown-render.js) in the CMS dark theme
- new ❓ Súgó entry in the CMS bottom bar
- steering rule: the guide must be updated in the same commit as any CMS or
website feature change
Closes MITHOME-57
