[feat] Added new documentation for Node.js guide

[kristiyan-velkov]

This PR introduces a comprehensive, language-specific guide for containerizing Node.js applications using Docker, aimed at helping developers streamline development, testing, and deployment workflows. It includes hands-on steps and real-world examples to configure CI/CD pipelines using GitHub Actions, following modern DevOps best practices.

What’s Included

• Step-by-step instructions to containerize Node.js applications using Docker.
• Configuration for a local development environment inside containers with automatic reloads.
• Guidance on running unit and integration tests within Docker containers.
• Full CI/CD pipeline setup using GitHub Actions for automated builds, tests, and deployments.
• Deployment instructions for a local Kubernetes cluster to validate production readiness.

Credits
Kristiyan Velkov, Docker Captain.

Reviews

• Technical review
• Editorial review
• Product review

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