docs: do not use polyfill.io due to a security issue #1173
Merged
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closes #1172
The only usage of polyfill[.]io is in the old v3 demos. Even though generally we are not maintaining those, we think this security issue is big enough to warrent a small change, for those who may stumble on these in the future.
This switches to using the safe cloudflare version instead: https://blog.cloudflare.com/automatically-replacing-polyfill-io-links-with-cloudflares-mirror-for-a-safer-internet