Docs: examples page -> gt-extras example

[juleswg23]

Summary

This PR adds a gt-extras example to the examples page, at the bottom in a new section called "ecosystem."

Related GitHub Issues and PRs

• Ref: #

Checklist

• I understand and agree to the Code of Conduct.
• I have followed the Style Guide for Python Code as best as possible for the submitted code.
• I have added pytest unit tests for any new functionality.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.45%. Comparing base (5196b53) to head (6e0f429).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #759      +/-   ##
==========================================
+ Coverage   91.43%   91.45%   +0.01%     
==========================================
  Files          47       47              
  Lines        5547     5558      +11     
==========================================
+ Hits         5072     5083      +11     
  Misses        475      475              

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