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

[danstowell]

@HolgerJeromin the (current) right-click menu options on the slippymap are only of interest to advanced users. Document it properly, we'll be fine. I like the Ctrl+RightClick suggestion

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/251#issuecomment-128055005
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