Port IndieAuth backend to mi

[Xe]

Blocked on #1

• https://indieweb.org/authorization-endpoint
• https://indieweb.org/token-endpoint
• set up an https://indieweb.org/h-card on the base template

on auth:

• if the domain is not christine.website, bail and fail
• check for token in cookies
• if it exists, verify that and continue with auth process

on token:

• prompt for the following scopes:
  • switch:current
  • switch:register
  • switch:history
  • posse:blog_update
  • posse:notify
  • webmention:lookup
  • webmention:history
• register the redirect uri into the token