[openstreetmap/openstreetmap-website] Migrate layer minimaps to MapLibre (Issue #6638)

[Minh Nguyễn]

1ec5 created an issue (openstreetmap/openstreetmap-website#6638)

The homepage’s Layers pane shows a series of live “minimaps” of the current viewport, one per featured layer. These minimaps are currently implemented as Leaflet maps distinct from the main slippy map. We don’t do much with the minimaps other than to display a particular layer noninteractively and synchronize it with the viewport. We should be able to migrate these maps over to MapLibre GL JS (#6234) before the main slippy map. This will help us catch device compatibility issues before they affect the more critical main map. It’ll also be the first time that we render layers other than Standard without the [maplibre-gl-leaflet](https://github.com/maplibre/maplibre-gl-leaflet/) compatibility shim.

https://github.com/openstreetmap/openstreetmap-website/blob/56b153f62b77543a24708e4958d6097e189d6eeb/app/assets/javascripts/leaflet.layers.js#L19-L20

Ironically, this will result in embedding a MapLibre map inside a Leaflet control, since we implement the Layers pane as an `L.OSM.SidebarPane`. I’d expect it to be fine from a performance and code management standpoint. The Shortbread and MapTiler OMT minimaps are already being rendered by MapLibre behind the scenes.

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