docs: add Beauty Diagram to community integrations

[levi840714]

📑 Summary

Adds Beauty Diagram to the community integrations list. It takes Mermaid (and PlantUML) source and renders polished, shareable SVG diagrams with deck-ready themes — for slides and documentation. Listed under the section matching each surface it ships on, following the existing conventions:

• Productivity tools — web editor, alongside similar in-browser editors (Mermaid Flow, Mermaid Studio by webtoolz)
• Other — bd CLI, for rendering from the terminal / CI
• Editor Plugins → VS Code — VS Code Marketplace extension, as a sub-item
• Productivity tools → Obsidian — Obsidian community plugin, as a sub-item

🔗 Links (all live)

• Web: https://www.beauty-diagram.com/
• CLI: https://www.beauty-diagram.com/developers/cli
• VS Code: https://marketplace.visualstudio.com/items?itemName=beauty-diagram.beauty-diagram
• Obsidian: https://community.obsidian.md/plugins/beauty-diagram

📏 Checklist

• Edited the source src/docs file, not the autogenerated one
• Ran pnpm --filter mermaid run docs:build so both files stay in sync
• Placed each entry under the matching section, following existing formatting

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Latest commit: 25d4469

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commit: 25d4469

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 24.36%. Comparing base (388ccd0) to head (25d4469).

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #7910       +/-   ##
============================================
- Coverage    67.78%   24.36%   -43.43%     
============================================
  Files          429       30      -399     
  Lines        38648     6925    -31723     
  Branches      6380      353     -6027     
============================================
- Hits         26199     1687    -24512     
+ Misses        9675     5238     -4437     
+ Partials      2774        0     -2774     

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