Add FastAPI-built OpenAPI docs to Sphinx docs

[jsstevenson]

Feature description

This tool lets you embed an openapi.json file in Sphinx docs: https://github.com/sphinx-contrib/openapi?tab=readme-ov-file

Of course, with FastAPI, we generate openapi.json dynamically. I think it would be doable to hook construction of the json into the docs build workflow but I'm a little woozy on doing this in #78 so I'm pinning it for later.

Use case

Auto generated documentation for API endpoints is helpful

Acceptance Criteria

• A workflow for RTD-hosted Sphinx docs that automatically generates and embeds docs for FastAPI endpoints

Proposed solution

No response

Alternatives considered

No response

Implementation details

No response

Potential Impact

No response

Additional context

No response

Contribution

Yes, I can create a PR for this feature.