Site API endpoint documentation

[sampullman]

A few examples are scattered here and there in READMEs, but it doesn't cover the full scope of the Site API.

Tasks

• Choose a documentation generation strategy
• Generate documentation for Site API
• Publish updated docs, preferably in CI (or hosted directly from the Site API)

Notes

Aide might be a good place to start.

[sampullman]

• Aide example
  • Setup
  • Routes
• Utoipa example