[jtcasper]

I just migrated our auth service for my employer and wrote up a guide on what I think you need to know and should do if you're going through it. I think it was overall incredibly straightforward, and the Yubico maintainers even added some additional functionality to their Java server-side library as I corresponded with them.

To plug myself a bit, hopefully this can be helpful to others, and I'd appreciate feedback if you find it unclear: https://www.jacobcasper.com/u2f2webauthn.html