No second logo for dark mode

[stefan-korn]

Currently a second logo is used for the dark mode:
https://github.com/virtualidentityag/stadtKoeln-openData-frontend/blob/main/src/partials/base/b_header.twig#L10

We would prefer to have only one logo used, especially as the logos do not differ other than in the color I suppose.

Couldn't we use some CSS styling to color the main logo for dark mode? Maybe CSS something like:

filter: brightness(0) invert(1);

One could maybe also use this in the footer: https://github.com/virtualidentityag/stadtKoeln-openData-frontend/blob/main/src/partials/base/b_footer.twig#L11 - in that case for both dark and light mode.

The reason behind this is, that we do not want to collect a second logo as this is not intended by Drupal and would need some Drupal customization we would rather not want to do.