Mermaid diagrams that have YAML front-matter can now be indented in
HTML code, see commit:
5cfa9196 (fix: support parsing indented mmd YAML from HTML, 2022-11-27)
Some diagrams previously had a mix of tabs/spaces for indentation.
In order for `dedent` to work, these diagrams had to be converted to
using a consistent indentation.
Sidharth Vinod