[openstreetmap-website] Use a hash anchor for location/zoom persistence (#378)

[John Firebaugh]

> Will the browser history remain un-polluted even if you refresh after a location.replace call?

Yes.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/378#issuecomment-21451608
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