#x509 validator

The intent was to check the valid until date on my websites' TLS certificates.

I got this far before I realized that WASM (GOARCH=wasm GOOS=js) does not support network calls. Even WASI (GOARCH=wasm GOOS=wasip1) can only support a subset, and even then only with a third-party library.

I guess I'll have to use node after all...

Leaving this here in case significant advancements are made in the near future.