{"gitdown": "theme"}
{"gitdown": "navigation:header", "up": true, "back": true, "home": true}

https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet

https://help.github.com/categories/writing-on-github/

{"gitdown": "video:youtube", "url": "https://www.youtube.com/watch?v=bz1Masw5QDs"}

{"gitdown": "site:card", "url": "https://www.foundmyfitness.com/"}

{"gitdown": "site:embed", "url": "https://www.foundmyfitness.com/"}

{"gitdown": "navigation:footer", "up": true, "back": true, "home": true}