move the info section to a About-Dialog

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## Feature request

**Which Nextcloud Version are you currently using:[Nextcloud Hub 25 Autumn](https://nextcloud.com/) (32.0.1)

**Is your feature request related to a problem? Please describe.**
It is hard to find the version of the Desktop client

**Describe the solution you'd like**
A simple About dialog show all information on the client and perhaps on the server as well. The dialog is displayed when right clicking an About-menu entry on the tray icon.

Add About... to the bottom

**Describe alternatives you've considered**
Created multiple items on the forum as I keep forgetting where this vital information is.

**Additional context**