By specifying mermaid as the language for a code block, you can use Mermaid diagrams.
Example
In:
```mermaid
graph LR
A --- B
B-->C[fa:fa-ban forbidden]
B-->D(fa:fa-spinner);
```
Out:
graph LR
A --- B
B-->C[fa:fa-ban forbidden]
B-->D(fa:fa-spinner);