ssl certificate error on https://s2geometry.io/

[gregsadetsky]

the ssl certificate for https://s2geometry.io/ seems to be invalid:

(this is probably due to an incorrect github pages / domain configuration)

verified here:

https://www.sslshopper.com/ssl-checker.html#hostname=s2geometry.io

https://www.ssllabs.com/ssltest/analyze.html?d=s2geometry.io&hideResults=on

https://www.geocerts.com/ssl-checker

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