discuss.yjs.dev has expired certificate

[davidisaaclee]

https://discuss.yjs.dev/ is giving SEC_ERROR_EXPIRED_CERTIFICATE.

Firefox doesn't give me an option to bypass this issue – from cursory reading, this might be because you've set Strict-Transport-Security, which might not be worth it if there's a chance certificates will accidentally expire again. related: yjs/yjs#715

(thanks for the stellar library!)