[openstreetmap/openstreetmap-website] Use Bootstrap toggle buttons for layers menu (PR #4674)

[Anton Khorev]

Rewrite of #3674 - layer buttons as [Bootstrap radio toggle buttons](https://getbootstrap.com/docs/5.3/forms/checks-radios/#radio-toggle-buttons)

Enables keyboard navigation for layer buttons which is missing now.

The only custom css is to:
- set button heights
- override borders to have hover effects because Bootstrap toggle buttons don't have any hover effect (they'd need another color to tell hover states apart from selected states, they solved it by removing hover states)

![image](https://github.com/openstreetmap/openstreetmap-website/assets/4158490/c0775b2d-de2b-49d2-992e-93455ed83028)
![image](https://github.com/openstreetmap/openstreetmap-website/assets/4158490/fb8c8af0-d742-48f3-b5c4-57bbf25fd34f)

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/4674

-- Commit Summary --

  * Use Bootstrap toggle buttons for layers menu

-- File Changes --

    M app/assets/javascripts/leaflet.layers.js (43)
    M app/assets/stylesheets/common.scss (43)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/4674.patch
https://github.com/openstreetmap/openstreetmap-website/pull/4674.diff

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