Add a cli.NoColour option for disabling all colour/style

[FollowTheProcess]

• Check $FORCE_COLOR and $NO_COLOR only once
• Add a cli.NoColour option
• Tweak the help layout

Summary

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.60%. Comparing base (9ad2b79) to head (b27f2e1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
+ Coverage   91.53%   91.60%   +0.07%     
==========================================
  Files           7        6       -1     
  Lines        1311     1299      -12     
==========================================
- Hits         1200     1190      -10     
+ Misses         79       77       -2     
  Partials       32       32              

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