Use `.well-known/cdt0/` folder

[sergey-shandar]

https://en.wikipedia.org/wiki/Well-known_URI

Either

• .well-known/cdt0/ or
• .well-known/ni/cdt0/. https://datatracker.ietf.org/doc/html/rfc6920#page-9

Also, see

• https://w3c-ccg.github.io/did-method-web/
• https://en.wikipedia.org/wiki/WebFinger
• https://github.com/jhass/nodeinfo