Add Mermaid Syntax Support for Docs and CMS Kit

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

I am trying to insert charts and graphs into my documents to show a user a project flow, but I cannot use common markdown syntax to put in mermaid charts.
I also cannot implement these code discussions on my blog, as the CMS Kit does not support them.

Describe the solution you'd like

I would like an implementation of Mermaid placed into the CMS Kit, and into the Docs module, so that we can display charts rather than having to link to https://mermaid.live with a massive URL string.

Additional context

There are a number of users on the Discord who have reacted well to the suggestion int he Ideas channel.

Start by locating the Docs module and CMS Kit rendering or Markdown pipelines, then determine how supported content extensions are integrated. The work is done when Mermaid syntax renders charts in both areas without requiring external mermaid.live links, with coverage for the relevant rendering paths.