chore(cli): mention prepare command in usage

[danielroe]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This adds the third CLI command to the printed out usage statement

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov]

Codecov Report

Merging #959 (f5a8ef1) into main (716dc1a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #959   +/-   ##
=======================================
  Coverage   67.59%   67.59%           
=======================================
  Files          59       59           
  Lines        6030     6030           
  Branches      679      679           
=======================================
  Hits         4076     4076           
  Misses       1945     1945           
  Partials        9        9           

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[manniL]

Suggestion: chore could be a better name for the semantic PR scope