Breaking: Change the way flags are configured to be consistent with Args

[FollowTheProcess]

• Breaking: Add cli.FlagOption for configuring flags
• Update the demo gifs

Summary

[codecov]

Codecov Report

❌ Patch coverage is 89.47368% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.73%. Comparing base (17a4e7a) to head (faf2064).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
option.go	84.61%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #186      +/-   ##
==========================================
- Coverage   87.77%   87.73%   -0.05%     
==========================================
  Files           8        8              
  Lines        1489     1500      +11     
==========================================
+ Hits         1307     1316       +9     
- Misses        121      122       +1     
- Partials       61       62       +1     

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