feat: update kargo logo

[Marvin9]

Updated Logo at

• Kargo UI
• Docs
• Login Splash screen
• README

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.54%. Comparing base (ec29733) to head (f4fd802).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2759      +/-   ##
==========================================
+ Coverage   49.52%   49.54%   +0.01%     
==========================================
  Files         271      271              
  Lines       19676    19685       +9     
==========================================
+ Hits         9745     9753       +8     
- Misses       9300     9301       +1     
  Partials      631      631              

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