Install MkDocs. Available through homebrew, pip, etc.
mkdocs.yml is where mkdocs specific configuration happens. See the MkDocs config documentation for more information on what is possible.
mkdocs serve from the constellation root directory wil start a development server that auto-builds and serves the docs at http://localhost:8000. This is very useful for testing out changes.
mkdocs gh-deploy will build the the files in docs-gh-pages, merge the changes into the constellation gh-pages branch, and push to origin/gh-pages.
Github is configured to serve the gh-pages branch at https://constellation-labs.github.io/constellation/.