[openstreetmap/openstreetmap-website] suggestion: geo URI handling (#2925)

[Markus Göllnitz]

Currently, the share tab on the OpenStreetMap website provides a geo URI. The website could become the receiving end as well.

a) The search currently supports of the form lat,lon, e.g. 52.6907,4.8059. If it internally stript the geo: prefix of the URI and optionally could make use of the zoom parameter z as in geo:52.6907,4.8059?z=15, the page could handle geo URIs in the search.

b) It then could use the ability to register a protocol handler via a Navigator API in JavaScript [(WHATWG § 8.9.1.3)](https://html.spec.whatwg.org/multipage/system-state.html#custom-handlers):  
`navigator.registerProtocolHandler("geo", "https://www.openstreetmap.org/search?query=%s", "open on OpenStreetMap.org");`. At least for Firefox and Opera according to the mdn/browser-compat-data [[2]](https://github.com/mdn/browser-compat-data/blob/fee6670cd7c0cce7b87b7cb67a0cc1f4a6b5566d/api/Navigator.json#L1815), as for Edge and Chrome the geo scheme is not listed. I was able to add this handler though on Chromium 86.0.4240.75 on Ubuntu.



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