Turns out that unpkg, an online service that Observable was relying on, was down yesterday (https://twitterc.om/unpkg/status/1636149026830843904), but this is fixed now. Sam Nolan thinks that it may have been cached by browsers, which is why it would show up broken for me but not for others, fixed now either way, though ¯\_(ツ)_/¯
Turns out that unpkg, an online service that Observable was relying on, was down yesterday (https://twitterc.om/unpkg/status/1636149026830843904), but this is fixed now. Sam Nolan thinks that it may have been cached by browsers, which is why it would show up broken for me but not for others, fixed now either way, though ¯\_(ツ)_/¯