Ignore twitter links when checking external links (#759)
Ignore twitter links when checking external links (#759)

* Ignore twitter links when checking external links

It seems to be serving 404s in CI for some (but not all) ordinary working URLs. e.g. see https://github.com/lit/lit.dev/runs/6104284767?check_suite_focus=true
lit/lit.dev,lit/lit.dev,lit/lit.dev