docs: use jpeg in README to look nicer in dark mode

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Latest commit: 53e510e

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Name	Status	Preview	Comments	Updated (UTC)
hey-api-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 19, 2024 3:43am

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.41%. Comparing base (24a0d09) to head (53e510e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1465   +/-   ##
=======================================
  Coverage   63.41%   63.41%           
=======================================
  Files         142      142           
  Lines       22258    22258           
  Branches     1846     1846           
=======================================
  Hits        14116    14116           
  Misses       8136     8136           
  Partials        6        6           

Flag	Coverage Δ
unittests	63.41% <ø> (ø)

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commit: 53e510e