Error message should provide link to ruget + miette bug trackers

[jmcp]

In @zkat's tweet https://twitter.com/zkat__/status/1428962008699793412/photo/1, the final message is

This is a bug. It might be in ruget, or it might be in the source
you're using, but it's definitely a bug and should be reported.

The question arises, to whom or what should the bug be reported?

Providing a link to both ruget and miette's Issues pages would be a great start, and if it's not in miette or ruget then whoever is maintaining those projects can guide the submitter to a more appropriate project to file a bug with.

[zkat]

so, there's two bits here: We already support arbitrary (clickable!) URLs for individual diagnostic codes. Second, we have #34, which I'm gonna mark this as a duplicate of, and close this issue.