Make mermaid diagrams work in Pajamas
This is a Follow-up from "Draft: docs(contribute): Move component lifecycle up" !2053 (merged)
Currently, Pajamas does not render mermaid diagrams in markdown pages.
Mermaid diagrams render as code blocks in markdown files. This is a useful tool for generation of diagrams and flowcharts from text, instead of using static images in the design docs pages.