docs: Add "ChatSight" to Using WXT section

[Abjcodes]

Added ChatSight to the extensions section.

Overview

Added ChatSight chrome extension to the extensions section

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[github-actions]

Thanks for helping make WXT better!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.00%. Comparing base (39321ad) to head (280121a).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1862      +/-   ##
==========================================
+ Coverage   80.82%   81.00%   +0.17%     
==========================================
  Files         131      131              
  Lines        6679     6679              
  Branches     1091     1096       +5     
==========================================
+ Hits         5398     5410      +12     
+ Misses       1270     1258      -12     
  Partials       11       11              

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