mx - CI - mdbook addons - admonition(callouts) and mermaid (code driven diagrams) with example implementation

[m0ham3dx]

Motivation

1. This is a followup to THIS message, where I had recommended the addition of the addons in this PR.
2. In order to increase the comprehension and readability of the manual, the presence of callouts and diagrams would be a good idea

Solution

This PR has the following two mdbook addons

1. mdbook-mermaid - Ability to add code driven diagrams via mermaid-js
2. mdbook-admonition - Ability toa dd colorful callouts

Note

1. In addition to adding the addons , I have also actually implemented both of them in the intro.md, after running the tests on a local branch, the artifacts created now contain the necessary .js and css files in the dir path, as described in their documentation
2. I have added some styling to the diagrams, colors have been extracted from reth banner. They are altered via hex color codes.
3. The addons have been directly added in the CI file - book.yaml, so every push should trigger the installation of the necessary files
4. Maybe I can add a note to the guidance documentation if you see fit.
5. During my tests all Github Actions have passed except the deployment action.

Q - Does this action require an update in the changelog ? as described in the PR guidance ?

PR Checklist

• Added Tests
• Added Documentation
• Updated the changelog
• Breaking changes

[gakonst]

Sweet - ty. Keen to use more diagrams / callouts.