Update DOCTYPE of static/index.html

[wuteek]

Updated the doctype from transitional xhtml 1.0 to html5 in index.html
Fixes #10973

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[gitpod-io]

[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/5978691117/artifacts/205823086

[codeclimate]

Code Climate has analyzed commit d5f73a1 and detected 0 issues on this pull request.

View more on Code Climate.

[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/5991882292/artifacts/206625596

[TildaDares]

Thanks @wuteek. Great job!!

[wuteek]

Thanks @wuteek. Great job!!

Thank you!

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[jywarren]

Excellent, thank you!!!