Feature request: Convert Mermaid Diagram text to SVG

**Is your feature request related to a problem? Please describe.**
There are use cases where it would be helpful to have a service deployable inside corporations to produce a SVG from a mermaid diagram.

**Describe the solution you'd like**
Add an entry to cyberchef to convert mermaid diagram text to SVG

**Describe alternatives you've considered**
Deploy [mermaid-server](https://github.com/jihchi/mermaid-server)

**Additional context**
Mermaid is a hugely popular javascript diagramming library.
Since mermaid is itself implemented in javascript, it should be easy to add to cyberchef.