Extending navbar logo settings with maxwidth - resolves #544

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[abias]

Hi @DocDanouBot,

thank you very much for working on this issue.

I just rebased your branch onto the latest main branch and reviewed your PR.
The general functionality works like a charm. I just had to make some review changes to align the feature with BU's general coding style and structure.

Regarding the integration of the PR, I would like to wait for a fix for #733 as - depending on the solution there - this PR might need some additional modification.

Cheers,
Alex