Features:
  - Disclaimers now support markdown formatting.
  - Add edit buttons for objects to the PlainUI, when a user has the permission to edit them.
  - Show the room image in the room detail view.
  - Add OIDC authentication support to APIv2.
  - Move the dect endpoint to the new integrations API.

Fixes:
  - Dereferrer: Links with # now work correctly.
  - The dereferrer error page now works in Fahrplan.
  - Add a shortcode fallback for dereferrer links without parameters.
  - Fix input placeholder styling.
  - Remove not applicable content from official assemblies (e.g. projects)
  - Add current commit to the ETag calculation to ensure cache invalidation on deploys.

Docs:
  - Improve documentation for APIv2 authentication.