Clarify which apps are recommended by the Nextcloud team, or "trusted" developers.

Currently it is difficult to tell which whiteboard app is maintained by the actual team. In fact, there appears to be more than one option.

Which app is the one users are expecting from Nextcloud 30 announcements?
Are any of apps listed not recommended?
Are any of the apps abandoned?

[Excalidraw Integration](https://apps.nextcloud.com/apps/integration_excalidraw), supported by Julien and Nextcloud core release
[Whiteboard](https://apps.nextcloud.com/apps/whiteboard), supported by Julius and Nextcloud core release
[Whiteboard integration](https://apps.nextcloud.com/apps/integration_whiteboard), supported by Julien in v25. Is this abandoned?

It would be great to visually identify in the listing which app is the one users should be considering now that the Whiteboard is officially being recommended as part of Nextcloud 30. What is the reasoning for two different, but equally active Excalidraw integration apps, and how can these apps be cleaned up in the appstore listings.

See also
- #1501