Update metadata for com.github.jms55.Sandbox

[razzeee]

This PR updates the metadata to improve discoverability and user experience for Sandbox.

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🏷️ Keywords

- simulation
- sandbox game
- sand simulation
- digital sand
- desktop sand

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Generated by Metadata Bot 🤖

[JMS55]

Unfortunately I don't have the time to maintain this project anymore.

[razzeee]

Then you should probably EOL it?

[JMS55]

Is there anything explicit I have to do? Flathub already says "Uses an end-of-life runtime". I thought I could just leave it up, and people could at least play it due to the runtime isolation.

[razzeee]

It's probably fine in your case, as it's a game, with no permissions.

Usually it would be better to eol as described here. https://docs.flathub.org/docs/for-app-authors/maintenance#end-of-life

It might only happen, that people raise issues here, thinking it's still supported :)