docs: 📚 Scribe - Align versions and modernize setup guides

[yacosta738]

This PR aligns the project documentation with the actual technical state of the repository. It updates version requirements for Node.js, Kotlin, and Spring Boot based on configuration files (.nvmrc, package.json, libs.versions.toml). It also modernizes the contributing guidelines to reflect the current Makefile-based development workflow, ensuring a smoother onboarding experience for new contributors.

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PR created automatically by Jules for task 9462057384250724786 started by @yacosta738

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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None

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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