Add mermaid preview with hugo syntax
Problem to solve
The mermaid preview in markdown preview works only if you use the ```mermaid syntax. But hugo uses this other syntax:
(I'm adding a space after < just to display it in the issue page) {{< mermaid>}} [...] {{< /mermaid>}}
Target audience
Every user/team that use hugo and mermaid.
Further details
This is especially useful for teams that are using gitlab pages with hugo and webIDE to edit those pages.
Proposal
In the preview parser, add a new trigger to start the mermaid rendering.
What does success look like, and how can we measure that?
The mermaid preview is working correctly on hugo pages.