Initialize JS/Vite project structure - Convert Rails app to modern JavaScript

[Copilot]

This PR completely converts the Rails-based "Get Down" application to a modern JavaScript application using Vite as the build tool. The core functionality of displaying songs with colorized chord progressions is preserved while eliminating Rails dependencies.

Key Changes

🔄 Architecture Migration

• Replaced Rails with Vite-based JavaScript application
• Converted server-side rendering to client-side application
• Implemented hash-based routing to replace Rails routes
• Migrated from Ruby/Rails to pure JavaScript/HTML/CSS

📁 Project Structure

• Created modern src/ directory structure with organized JS, CSS, and data files
• Added package.json with Vite dependencies and build scripts
• Set up vite.config.js for development and production builds
• Added comprehensive .gitignore for Node.js projects

🎵 Data Migration

• Converted database seeds (db/seeds.rb) to JSON format (src/data/songs.json)
• Preserved original song data including "You Are My Sunshine" and "La Mer"
• Maintained chord progression information and artist metadata

🎨 Style Conversion

• Converted SCSS files to modern CSS with custom properties
• Preserved original visual design and chord colorization
• Replaced Rails asset pipeline with Vite's native CSS processing
• Maintained Blueprint CSS grid functionality with simplified equivalent

⚡ Functionality Preservation

• Song listing with artist and title display
• Individual song views with chord/lyric parsing
• Colorized chord progressions using the same color scheme
• Navigation between list and detail views
• Responsive layout matching original design

🧹 Cleanup

• Removed all Rails-specific files and directories (app/, config/, db/, etc.)
• Deleted Ruby dependencies (Gemfile, Gemfile.lock)
• Eliminated Rails configuration files and scripts

Usage

The application now uses standard Node.js/npm commands:

npm install        # Install dependencies
npm run dev        # Start development server
npm run build      # Build for production
npm run preview    # Preview production build

The development server runs on http://localhost:3000 and provides the same functionality as the original Rails application, but with faster development iteration and modern JavaScript tooling.

Fixes #9.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[Copilot]

@nickh 👋 This repository doesn't have Copilot instructions. With Copilot instructions, I can understand the repository better, work faster and produce higher quality PRs.

I can generate a .github/copilot-instructions.md file for you automatically. Click here to open a pre-filled issue and assign it to me. I'll write the instructions, and then tag you for review.