[openstreetmap-website] Add an overpass based query tool (#721)

[Saman Bemel-Benrud]

I find the '?' icon pretty sensible for this interaction, even though it is an overloaded symbol. It could also mean 'help. Magnifying glass, which is the other option, is overloaded too, as @pnorman mentioned.

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https://github.com/openstreetmap/openstreetmap-website/pull/721#issuecomment-62054346
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