Objectives:

• Setup of a minimal account server.
• Users can register an account which they can prove with the UCAN they received from the registration endpoint. That UCAN will be usable with other services that will later be added to this repo as a separate crate.

Features:

• Signups
• Ability to register DNS
• DIDs + UCANs

Starmap issue: fission-codes/Fission-Starmap#43