Doxygen issues
A collection of current issues in our Doxygen documentation: - [x] LaTeX does not seem to render, see https://hyteg.pages.i10git.cs.fau.de/hyteg/10_DGAMR.html (see https://i10git.cs.fau.de/hyteg/hyteg/-/issues/256#note_29522) - [x] CI badges in README do not link to CI (should be fixes with !735) - [x] some links in the README do not work correctly when clicked in GitLab (should be fixes with !735) - [x] issues with `\snippet` (see [below](https://i10git.cs.fau.de/hyteg/hyteg/-/issues/256#note_29629)) - [x] issues with method documentation (see [below](https://i10git.cs.fau.de/hyteg/hyteg/-/issues/256#note_29698))
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