Remove the color_scheme example and the dependency on clap

[Ogeon]

This removes the color scheme example, which didn't show much anyway, and the dependency on clap. It has caused issues from time to time, and the final nail in the coffin was #364.

Closed Issues

• Closes #364, by removing it instead.

[codecov[bot]]

Codecov Report

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

Comparison is base (e3686f6) 81.46% compared to head (b43b855) 81.46%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #370 +/- ## ======================================= Coverage 81.46% 81.46% ======================================= Files 113 113 Lines 18438 18438 Branches 18438 18438 ======================================= Hits 15021 15021 Misses 3220 3220 Partials 197 197 ```

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[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #370 will degrade performances by 12.2%

_{Comparing remove_color_scheme_and_clap (b43b855) with master (e3686f6)}

Summary

❌ 1 (👁 1) regressions ✅ 44 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	remove_color_scheme_and_clap	Change
👁	multiply_3x3	400 ns	455.6 ns	-12.2%