Updates to the protocol documentation (and its generator)

[ethomson]

Summary

Running docusaurus build generates warnings on the generated protocol documentation, most are false positives, but three are correct (which were buried by the other false positives).

The false positives arise because we use our own anchors for linking things like request, response, and scalar types. However, docusaurus's link checker doesn't know about these generated anchors and emits false positives. This PR updates the generator to instead create React components to generate the titles and anchors, so that we can tell docusaurus about them. Its link checker will then not emit a false positive.

Then, the links to the types assume that we document all of them on this page. But the google.protobuf.* types are not documented by us. Create a TypeLink component that understands this difference and links to the protobuf docs for things like Timestamp.

Change Type

Mark the type of change your PR introduces:

• Bug fix (resolves an issue without affecting existing features)
• Feature (adds new functionality without breaking changes)
• Breaking change (may impact existing functionalities or require documentation updates)
• Documentation (updates or additions to documentation)
• Refactoring or test improvements (no bug fixes or new functionality)

Testing

Run npm run build in the docs folder and ensure that there are no warnings.

Review Checklist:

• Reviewed my own code for quality and clarity.
• Added comments to complex or tricky code sections.
• Updated any affected documentation.
• Included tests that validate the fix or feature.
• Checked that related changes are merged.

[coveralls]

coverage: 52.006% (+0.009%) from 51.997%
when pulling d69f2fe on ethomson/proto_docs
into 5d519d3 on main.

[eleftherias]

This looks good now, but there are some merge conflicts

[ethomson]

This looks good now, but there are some merge conflicts

rebased on main

[coveralls]

coverage: 51.884%. remained the same
when pulling 1685bf6 on ethomson/proto_docs
into 924bd1a on main.

[coveralls]

coverage: 51.884%. remained the same
when pulling b79fbe3 on ethomson/proto_docs
into 924bd1a on main.