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

[John Firebaugh]

Another advantage is that after you visit a permalink (a shared or bookmarked link, or the "View" tab link) and move the map around a bit, refreshing preserves the current location rather than resetting to the original one, which can be pretty annoying.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/378#issuecomment-21907448
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