[openstreetmap-website] Implement `geo:` URLs for sharing (#799)

[simonpoole]

@erictheise osmand on android: thats because it is either the sole app on the device that has registered itsself for for view intents with a intent-filter that includes geo: (unlikely) or it has been set as the "standard application" for duch intents. In other words check the settings, which should include a way of resetting default applications.

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https://github.com/openstreetmap/openstreetmap-website/issues/799#issuecomment-112323265
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