Add self-contained Mermaid diagram support via Goldmark#49

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Copilot wants to merge 8 commits intomainfrom

copilot/add-mermaid-diagram-support

Commits on Dec 23, 2025

Initial plan
Copilot
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Replace golang-commonmark with Goldmark and add Mermaid support

Copilot
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mapitman
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Address code review feedback: improve regex check, remove dead code, fix title extraction

Copilot
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mapitman
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Add mermaid.min.js to repository for offline self-contained rendering

Copilot
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mapitman
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Move CDN regex to package level and make it more flexible

Copilot
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mapitman
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Simplify embedMermaidScript and make regex more flexible

Copilot
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mapitman
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Fix CDN script loading - use NoScript option and embed mermaid.js properly

Copilot
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mapitman
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Fix script escaping to include closing bracket and improve comments

Copilot
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mapitman
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