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

[John Firebaugh]

Yes, we'll be losing that ability on sites that use lon, lat, and zoom query parameters. On the other hand, we'll be gaining the ability on sites that use zoom/lat/lon hash parameters (i.e. any that use leaflet-hash). And on the third hand, it will be easier to write a bookmarklet that auto-opens other sites at the current location, because it's easily determined from `location.hash` (whereas before you would have to delve into JS or DOM internals with no guarantee of stability).

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/378#issuecomment-21463066
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