doc/doxygen: fix sidenav handling #20631
Merged
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Contribution description
In https://github.com/RIOT-OS/RIOT/pull/20511/files a quick fix was added to allow resizing the sidenav. But this broke hiding the sidenav on mobile screen widths. This fixes the issue and also increase the default sidenav width a tad.
Testing procedure
Check the generated doc preview also from a mobile device. It should no longer display the sidenav on small form factors (e.g. phones, or browsers resized to a narrow view) but still allow resizing the sidenav with the mouse on larger form factors.
Issues/PRs references
Fixes regression from #20511