Mermaid diagrams provide a way to display graphs defined as plain text. Some markdown renderers support this as a plugin. GitHub now supports it.
You can define nodes like this in mermaid, and GitHub will now render
them as a pretty graph diagram. Its rendered in svg, so its searchable
control f and everything.
graph TD; A-->B; A-->C; B-->D; C-->D-->OUT; E-->F-->G-->OUT