Use mermaid for Diagrams?

[mmcky]

@kp992 have you used mermaid before?

https://mermaid.js.org

Wondering if we should give this a go for generating some of these figures. It will be natively available when we move over to mystjs so figures wouldn't need to be tracked as a static asset which would be great and in current jupyterbook we could use

https://github.com/mgaitan/sphinxcontrib-mermaid

• test compatibility with LaTeX outputs

moved from QuantEcon/lecture-python-intro#394