♻️ refactor: unify and rephrase options descriptions

[welpo]

Summary

Unifies --help and default config strings.

Now there's one source of truth for these strings, which will become handy for the next PR ✌️

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How has this been tested?

• [X] Manual tests
• [ ] Unit tests
• [X] Integration tests

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Type of change

• [ ] Bug fix (fixes an issue without altering functionality)
• [ ] New feature (adds non-breaking functionality)
• [ ] Breaking change (alters existing functionality)
• [ ] UI/UX improvement (enhances user interface without altering functionality)
• [X] Refactor (improves code quality without altering functionality)
• [ ] Documentation update
• [ ] Other (please describe below)

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Checklist

• [X] I have read the contributing guidelines.
• [ ] I have added tests to cover my changes.
• [X] All new and existing tests passed.
• [X] My code follows the code style of this project.
• [X] I have formatted the code with cargo fmt.
• [X] My change requires updating the documentation.
• [X] I have updated the documentation accordingly.

[codecov-commenter]

Codecov Report

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

Comparison is base (8eca1e3) 95.81% compared to head (b2ac378) 95.83%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #12 +/- ## ========================================== + Coverage 95.81% 95.83% +0.01% ========================================== Files 10 10 Lines 622 624 +2 ========================================== + Hits 596 598 +2 Misses 26 26 ```

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