Web Accessibility of Plots2

[Natacha-Danbadan]

I worked on the accessibility of the site hence ensuring semantic html for all html files (404, 500, 502, 422, 503) contained in the plots2 repository; https://github.com/publiclab/plots2/tree/main/public

Fixes #11494

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[codeclimate]

Code Climate has analyzed commit 97edbc9 and detected 0 issues on this pull request.

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[TildaDares]

Amazing work @Natacha-Danbadan. Thank you!

[github-actions]

This pull request generated screenshots of many common pages in the running app. You should be able to download and view them here:
https://github.com/publiclab/plots2/suites/8929577195/artifacts/432355722

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