Show warning on bundled apps page

[susnux]

Some users are confused that the app store page shows only outdated versions, e.g. for the circles app.
For example:

Highest Nextcloud version
Nextcloud 21

This leads to the belief that enabling those apps is insecure and dangerous, but in reallity those apps are nowadays bundled with the server and always up-to-date.

Especially this is a problem for files_pdfviewer.

Solutions I can think of:

• Remove bundled apps from app store
• Remove and only forward to a page like "This app is bundled with the server"
• Add a warning (e.g. like below)

But maybe you have other ideas?

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Example for the warning:

[bigcat88]

I am voting for removing them