Mermaid testing

This is just to check what Mermaid version github uses.

In a mermaid block including this shows the version

info

Current version:

info

Elk test:

---
config:
  layout: elk
  look: handDrawn
  theme: forest
---
graph LR
    A[Square Rect] -- Link text --> B((Circle))
    A --> C(Round Rect)
    B --> D{Rhombus}
    C --> D