[openstreetmap/openstreetmap-website] Allow temporarily sliding away the side panel, without losing the object of our query / URL (#3303)

[積丹尼 Dan Jacobson]

It's quite standard on Google and Bing Maps:
![20221128T022336](https://user-images.githubusercontent.com/1230959/204228946-b6663a3d-2181-46f1-851d-cb1937d0bdf8.jpg)
![20221128T022720](https://user-images.githubusercontent.com/1230959/204229633-1eff3917-364f-4dd1-ac4e-05736d795bcf.jpg)
An X at the top, and an arrow at the right.

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