Re: [openstreetmap/openstreetmap-website] Migrate new vector layers from maplibre-gl-leaflet to “unwrapped” maplibre-gl-js (Issue #6234)

[Tobias]

tordans left a comment (openstreetmap/openstreetmap-website#6234)

> MapLibre GL JS has built-in support for GeoJSON overlays, so we only need a library for the conversion from that JSON format to GeoJSON, but not for the overlay classes themselves. I know of three such libraries: osmtogeojson, osm2geojson-lite, and osm2geojson-ultra. 

Or, we find a way to do the conversion to GeoJSON on the source: 
* For Overpass there is https://github.com/drolbr/Overpass-API/issues/761 but there is also https://github.com/drolbr/overpass-doc/blob/master/en/targets/formats.md which explains how to transform the overpass JSON output with `convert item ::=::,::geom=geom(),_osm_type=type();`. We would have to test this against what osm2geojson does, though. 
* And for anything we server directly, something like a proxy in Rails that does the transformation would work. There are/where projects like this already https://blog.k-nut.eu/overpass-geojson-proxy and I think this would be a nice but small addition to our service area (AKA services that we offer). It would, hover, require us to find a shared way to define how what lines we consider an area. I see that osm2geojson-ultra does this [in a static file](https://github.com/dschep/osm2geojson-ultra/blob/main/src/polytags.json). iD and OSMCha use a different approach, AFAIK both https://github.com/ideditor/id-area-keys which is not updated ATM. Maybe we should try to revitalize this projects?

(Thanks for pointing out `osm2geojson-ultra`, did not know about that, yet.)

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