Using YAML frontmatter - GitHub Docs
https://docs.github.com/en/contributing/writing-for-github-docs/using-yaml-frontmatter
The following frontmatter values have special meanings and requirements for GitHub Docs. There's also a schema that's used by the test suite to validate every page's frontmatter. For more information, see lib/frontmatter.ts.
docs/src/frame/lib/frontmatter.ts at main ยท github/docs
https://github.com/github/docs/blob/main/src/frame/lib/frontmatter.ts
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