docs: use readme image fallback

[ilyaZar]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.61%. Comparing base (a1c06e5) to head (8242558).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   87.59%   87.61%   +0.02%     
==========================================
  Files           6        6              
  Lines        5102     5112      +10     
==========================================
+ Hits         4469     4479      +10     
  Misses        633      633              

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