Mermaid.js for basic diagrams?

[themkat]

Sometimes it is useful to have some diagrams to show concepts that are best shown graphically. Makes it easier than handling images inline for all sorts of things...

https://mermaid.js.org/

Possible tooling to make the experience of making these diagrams more enjoyable:
https://github.com/abrochard/mermaid-mode

If I can mix this with some sort of Org-block, then that would be the best solution.