Web Accessibility of Leaflet.DistortableImage.

[Natacha-Danbadan]

I added the body closing tag for some of the html files, and I also worked on the general accessibility of all html files (archive.html, export.html, index.html, listeners.html, select.html) in the repo: https://github.com/publiclab/Leaflet.DistortableImage/tree/main/examples

Fixes #11494

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