add mermaid support for making diagrams

[jforman]

https://gohugo.io/content-management/diagrams/#mermaid-diagrams

Description

Mermaid JS library provides the ability to create markdown-based diagrams and charts within your Hugo markdown.

This PR provides the ability for a user to include those diagrams in their posts, pages, etc.

Issue Number:

n/a

Additional Information (Optional)

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Checklist

Yes, I included all necessary artefacts, including:

• [ ] Tests
• [ ] Documentation
• [X] Implementation (Code and Ressources)
• [ ] Example

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Testing Checklist

Yes, I ensured that all of the following scenarios were tested:

• [X] Desktop Light Mode (Default)
• [X] Desktop Dark Mode
• [ ] Desktop Light RTL Mode
• [ ] Desktop Dark RTL Mode
• [ ] Mobile Light Mode
• [ ] Mobile Dark Mode
• [ ] Mobile Light RTL Mode
• [ ] Mobile Dark RTL Mode

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@jforman

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[lxndrblz]

Closes #360 .