graph TD;
A-->B;
A-->C;
B-->D;
C-->D;
This is done using the GitHub + Mermaid browser extension https://github.com/BackMarket/github-mermaid-extension. The chrome extension to render this is at https://chrome.google.com/webstore/detail/github-%20-mermaid/goiiopgdnkogdbjmncgedmgpoajilohe.
Please note all the diagrams in the /diagrams/ directory are generated using a shell script based on the categories tags in entries.