Resolve "Add diagram support"
What is the current behavior
Diagrams are not displayed.
What is the new behavior
Mermaid diagram support has been enabled:
```mermaid graph TD; A-->B; A-->C; B-->D; C-->D; ```
Closes #30 (closed)
What is the current behavior
Diagrams are not displayed.
What is the new behavior
Mermaid diagram support has been enabled:
```mermaid graph TD; A-->B; A-->C; B-->D; C-->D; ```
Closes #30 (closed)