Review Resolver documentation

[jsjiang]

Review documentation in the Resolver repo

• readme: https://github.com/CDLUC3/resolver
• matching: https://github.com/CDLUC3/resolver/blob/main/docs/matching.md

Questions:

• are the docs up-to-date?
• any docs in other places?
• anything else need to be documented?

[jsjiang]

Pages/Docs to review:

• Readme -
• _docsrc -
  • are the files up-to-date?
  • how to use the build command to generate final docs
• docs - only one file here
  • matching.md