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

[Peter]

What not use a solution like History.js where you use the HTML5 history rewrite feature if available and falls back to hash if not available? It contains some quirks but several sites including [my own](http://graphhopper.com) are using it successfully.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/378#issuecomment-21535761
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