Consider removing LibreOffice Math

It’s super specialized and probably only used by very few Tails users.
- Users who need it probably know what it is already and can install it using Additional Software.
- Bonus, I’ll get everybody rid of the top-level menu “Science” in “Applications” and help newcomers find their way. Cf #11248 (closed).
- It might also save us some megabytes.

Let’s try and see :)

Feature Branch: feature/16911-remove-libreoffice-math

Original created by @sajolida on 16911 (Redmine)

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