Add micro Hero Icons

[DavidVollmers]

• Fix the Hero Icon generator
• Generate all micro Hero Icons from https://github.com/tailwindlabs/heroicons/tree/master/optimized/16/solid
• Generate alle Hero Icons in parallel for build time reduction

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.36%. Comparing base (34b5a4b) to head (13ec687).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
+ Coverage   42.06%   42.36%   +0.30%     
==========================================
  Files          82       82              
  Lines        2299     2299              
  Branches      445      445              
==========================================
+ Hits          967      974       +7     
+ Misses       1196     1189       -7     
  Partials      136      136              

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