docs: eliminate onboarding workflow drift

[tri-pti]

Pull Request

Description

This PR centralizes the onboarding workflow by making QUICKSTART.md the canonical onboarding document. It removes duplicated onboarding instructions from other documentation files, adds a clear documentation ownership structure, and introduces a CI check to prevent future documentation drift.

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Related Issue

Closes #64

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GitHub Username

GitHub Profile: @tri-pti

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Type of Change

• Documentation update
• Added my name to contributors list
• Bug fix
• Enhancement
• Other (please specify)

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Contributor Checklist

• I have read the CONTRIBUTING.md guidelines
• I have followed the repository contribution process
• I have added my name in the correct format (if applicable)
• My changes do not introduce unnecessary modifications
• I have reviewed my changes before submitting

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Screenshots (if applicable)

N/A

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Additional Notes

Changes included:

• Designated QUICKSTART.md as the canonical onboarding guide.
• Replaced duplicated onboarding workflow sections in README.md, CONTRIBUTING.md, and FAQ.md with references to QUICKSTART.md.
• Added a documentation ownership structure in CONTRIBUTING.md to define the responsibility of each documentation file.
• Added a CI documentation consistency check (check-doc-drift.sh) and integrated it into the GitHub Actions workflow to detect duplicated onboarding instructions and help prevent future documentation drift.

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