feat: Initial commit of Yoto Up Covers web application

- Added main HTML file (index.html) for the web app interface.
- Created a sample cover template (sample_cover.html) for Yoto cards.
- Implemented a simple HTTP server (server.py) to serve the web app.
- Configured package.json for project metadata and scripts.

DEPLOYMENT.md

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+# Static Site Deployment
+
+The Yoto Up Covers web app is a **100% static application** that can be deployed to any static site hosting service.
+
+## Required Files for Deployment
+
+Only these two files are needed for the web app to function:
+
+```
+web_app/
+├── index.html    # Main application
+└── app.js        # Application logic
+```
+
+## Hosting Options
+
+### 1. GitHub Pages (Free)
+```bash
+# Create a new repository
+git init
+git add index.html app.js
+git commit -m "Initial commit"
+git branch -M main
+git remote add origin https://github.com/yourusername/yoto-covers.git
+git push -u origin main
+
+# Enable GitHub Pages in repository settings
+# Your app will be available at: https://yourusername.github.io/yoto-covers/
+```
+
+### 2. Netlify (Free tier available)
+```bash
+# Install Netlify CLI
+npm install -g netlify-cli
+
+# Deploy
+netlify deploy --prod --dir web_app --public
+```
+
+### 3. Vercel (Free tier available)
+```bash
+# Install Vercel CLI
+npm install -g vercel
+
+# Deploy
+cd web_app
+vercel --prod
+```
+
+### 4. Manual Upload
+Simply upload `index.html` and `app.js` to any web hosting service:
+- AWS S3 + CloudFront
+- Firebase Hosting
+- DigitalOcean Spaces
+- Any traditional web host
+
+## Features That Work Offline
+
+- ✅ Template customization
+- ✅ Color picker
+- ✅ Image upload and editing
+- ✅ Live preview generation
+- ✅ HTML export
+- ✅ Print functionality
+
+## Browser Requirements
+
+- Modern browser with HTML5 support
+- File API (for image uploads)
+- Blob URLs (for previews)
+- No server-side dependencies
+
+## Demo
+
+A live demo can be viewed by opening `index.html` in any modern web browser.