[openstreetmap-website] Add an option to "Copy BBox info to Clipboard" (#783)

[DaCor1]

Currently when transcribing BBox info, its easy to make a mistake. 

What I am suggesting is a simple button on the Export section of the homepage, when clicked will place the following into your clipboard

"BBox Details: North -29.1050, South -29.1813, East 27.8253, West 27.6722"

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/783
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