Docs: Set up a Docs Site for ApiEndpoints using GitHub Pages

[Steve Smith]

Model this on the Ardalis.Specification approach:

• https://github.com/ardalis/Specification/tree/main/docs
• https://ardalis.github.io/Specification/
• https://docs.github.com/en/pages/getting-started-with-github-pages/creating-a-github-pages-site