Fix broken thumbnail image link

[mustan-ali]

Description

This PR fixes a broken thumbnail image link by updating the URL to point to the correct raw GitHub content location. The previous link referenced an invalid path, causing the thumbnail to fail to load. Updating the URL restores proper image rendering without impacting functionality or UX.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.64%. Comparing base (2741a03) to head (c9d5bfe).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20891      +/-   ##
==========================================
- Coverage   66.65%   66.64%   -0.02%     
==========================================
  Files         210      210              
  Lines       20277    20277              
  Branches     2639     2639              
==========================================
- Hits        13516    13513       -3     
- Misses       6664     6666       +2     
- Partials       97       98       +1     

see 2 files with indirect coverage changes

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