fix: community theme and menus visibility

[ptamarit]

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Description

We noticed that the community CSS theme was not mapped, and found out that the problem was related to the pull request #958.

It is likely that the pull request was authored before other changes were introduced, and that rebasing accidentally rolled back these recent changes (since the PR consists of moving code between different files).

The changes which got rolled back by mistake are:

• Mapping of the CSS theme
• Some visible_when conditions
• The order of the menu items, but this was then also modified in the pull request ext: space-out community menu items #1125.

Checklist

Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:

• I'm aware of the code of conduct.
• I've created logical separate commits and followed the commit message format.
• I've added relevant test cases.
• I've added relevant documentation.
• I've marked translation strings (for relevant code).
• I've followed the CSS/JS and React guidelines (for relevant code).
• I've followed the web accessibility guidelines (for relevant code).
• I've followed the user interface guidelines (for relevant code).
• I've identified the copyright holder(s) and updated copyright headers for touched files (>15 lines contributions).
• I've NOT included third-party code (copy/pasted source code or new dependencies).

Third-party code

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