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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.