Adds Unison programming language to community integrations list

[rlmark]

📑 Summary

This PR adds Unison as a mermaid community integration

Our documentation built-ins natively support Mermaid diagram rendering.

Resolves # N/A

📋 Tasks

Make sure you

• 📖 have read the contribution guidelines
• 💻 have added necessary unit/e2e tests.
• 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
• 🔖 targeted develop branch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6028036) 79.38% compared to head (303e5be) 79.38%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #5180   +/-   ##
========================================
  Coverage    79.38%   79.38%           
========================================
  Files          166      166           
  Lines        13886    13886           
  Branches       707      707           
========================================
  Hits         11024    11024           
  Misses        2708     2708           
  Partials       154      154           

Flag	Coverage Δ
e2e	85.19% <ø> (ø)
unit	43.04% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[mermaid-bot]

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