[openstreetmap-website] Introduce Geo URI to Share panel, take 2. (#994)

[Holger Jeromin]

Osmand (and probably others) adds `?z=20` to the url. Seems to be non standard and [ignored](https://github.com/MarcusWolschon/osmeditor4android/blob/d0cace31061f20ef38ae6b1b43c06ba7ab2201c8/src/de/blau/android/GeoUrlActivity.java#L33) by Vespucci. But perhaps worth to add.

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