feat: Implement comprehensive repository improvements

- Set up ESLint and Prettier for code quality
- Split large script.js into modular architecture (DOM, animations, effects, easter-eggs, sound, interactions)
- Organize assets into proper directory structure (assets/css, assets/js/modules, assets/images)
- Add semantic HTML5 landmarks (header, main, nav, footer)
- Implement ARIA labels and keyboard navigation for accessibility
- Set up Vite build system with minification and optimization
- Add CSS custom properties for design tokens
- Create sitemap.xml and robots.txt for SEO
- Add MIT LICENSE
- Expand README with comprehensive documentation
- Set up GitHub Actions CI/CD workflow
- Optimize build output: ~59KB total (30KB image + 13KB CSS + 16KB JS gzipped)

Co-authored-by: ZaneThePython <102631678+ZaneThePython@users.noreply.github.com>

.github/workflows/ci.yml

@@ -0,0 +1,45 @@
+name: CI
+
+on:
+  push:
+    branches: [ main, copilot/** ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  lint-and-build:
+    runs-on: ubuntu-latest
+    
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x]
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      
+    - name: Setup Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v4
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'npm'
+        
+    - name: Install dependencies
+      run: npm ci
+      
+    - name: Run ESLint
+      run: npm run lint
+      
+    - name: Check formatting
+      run: npm run format:check
+      
+    - name: Build project
+      run: npm run build
+      
+    - name: Upload build artifacts
+      if: matrix.node-version == '20.x'
+      uses: actions/upload-artifact@v4
+      with:
+        name: build-artifacts
+        path: dist/
+        retention-days: 7