docs(config/configuration_file.md): document --config option

[Stoiicc]

Description

Documented the --config CLI option in the configuration documentation .

Checklist

• I have read the contributing guidelines

Code Changes

• Add test cases to all the changes you introduce
• Run uv run poe all locally to ensure this change passes linter check and tests
• Manually test the changes:
  • Verify the feature/bug fix works as expected in real-world scenarios
  • Test edge cases and error conditions
  • Ensure backward compatibility is maintained
  • Document any manual testing steps performed
• Update the documentation for the changes

Documentation Changes

• Run uv run poe doc locally to ensure the documentation pages renders correctly
• Check and fix any broken links (internal or external) in the documentation

Expected Behavior

Users can easily discover the --config option in the documentation.

Additional Context

Fixes #1669

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.88%. Comparing base (de5c7a9) to head (8f4dde5).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1770   +/-   ##
=======================================
  Coverage   97.88%   97.88%           
=======================================
  Files          60       60           
  Lines        2606     2606           
=======================================
  Hits         2551     2551           
  Misses         55       55           

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[bearomorphism]

LGTM! A few nits

[bearomorphism]

LGTM! Thanks!