Copilot/add gui and website for users

[QTechDevelopment]

This pull request introduces a new interactive learning platform for the "33 JavaScript Concepts" repository, allowing users to browse, experiment with, and run JavaScript code examples directly in their browser. The update includes a new GUI, a local server for development, and comprehensive documentation for getting started. The most important changes are grouped below:

Interactive Learning Platform Implementation

• Added a new interactive GUI with a sidebar to browse concepts, a live code editor, real-time console output, search functionality, and keyboard shortcuts. This includes new files: public/index.html, public/app.js, and public/styles.css. [1] [2] [3]
• Introduced server.js to serve static files locally, enabling users to run the interactive platform with Node.js.
• Updated package.json to add start and dev scripts for launching the server.

Documentation and Getting Started

• Added a new QUICKSTART.md guide detailing setup steps, features, requirements, and usage tips for the interactive platform.
• Enhanced README.md to highlight the new interactive learning features, usage instructions, and keyboard shortcuts. [1] [2]

These changes collectively make the repository more accessible and engaging for learners by providing an interactive environment for exploring JavaScript concepts.