[openstreetmap-website] Redesign (#498)

[Paul Norman]

> > Potential performance issue: If you zoom in, hit history, then zoom out you get history querying for massive areas which you couldn't get to by zooming first then pressing history.
> Yeah, this is a concern. What's the best way to validate the performance characteristics here?

@tomhughes did some investigation last night - it's using the btree created_at index nearly all the time. Given this, my guess is middle zooms are no worse right now than high zooms. If this is so, then there's no performance concern, and also no reason to disable History at middle or lower zooms.

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https://github.com/openstreetmap/openstreetmap-website/pull/498#issuecomment-29037442
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