I used mermaid, which gets live-compiled on the website, that is built using quarto. Here is an example:
```{mermaid}
flowchart LR
A -- 1 --- B
B -- 2 --- C
B -- 8 --- E
C -- 3 --- D
C -- 9 --- F
D -- 10 --- E
D -- 4 --- G
G -- 5 --- H
G -- 6 --- F
E -- 9 --- F
```
```{mermaid} flowchart LR A -- 1 --- B B -- 2 --- C B -- 8 --- E C -- 3 --- D C -- 9 --- F D -- 10 --- E D -- 4 --- G G -- 5 --- H G -- 6 --- F E -- 9 --- F ```