[openstreetmap-website] Add right click menu. (#251)

[Leo Koppelkamm]

Btw, on Firefox/Chrome I don't get anything useful in the native menu:
* Save Image
* View Image in new tab
* Copy Image Url 
* Set as Desktop Background

Nothing particular useful for a tiled map. 

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/251#issuecomment-17455111
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