Add JWK and did:web support

[dwight-holman]

These were proposed for additional supported DID methods, so we should add them before the spec is "done".

• did:jwk https://github.com/quartzjer/did-jwk/blob/main/spec.md
• did:web https://w3c-ccg.github.io/did-method-web/

[Sakurann]

did:web has been agreed and added to the profile text in PR #23

[Sakurann]

Could we potentially close this issue and have a separate issue discussing did:jwk vs did:key vs did:ebsi?