docs: add webtoolz Mermaid Studio to community integrations

[kaialder]

Adding Mermaid Studio by webtoolz to the community integrations list under Productivity tools.

What it is:

• Free, browser-based Mermaid editor
• Live preview as you type
• 4 curated themes (default, dark, forest, neutral)
• Unlimited PNG/SVG export
• Shareable links
• 100% client-side, no signup required

Placed alphabetically next to Mermaid Flow Visual Editor in the Productivity tools section.

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Latest commit: 693c83f

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@mermaid-js/examples

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commit: c9979f3

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 3.53%. Comparing base (8cbfd07) to head (693c83f).
⚠️ Report is 16 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #7400      +/-   ##
==========================================
- Coverage     3.53%   3.53%   -0.01%     
==========================================
  Files          495     496       +1     
  Lines        49196   49207      +11     
  Branches       772     772              
==========================================
  Hits          1741    1741              
- Misses       47455   47466      +11     

Flag	Coverage Δ
unit	3.53% <ø> (-0.01%)	⬇️

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	Mar 12, 2026, 4:37 PM