Configure CSS as generated asset, not committed to git

- Added public/style.css to .gitignore
- Removed style.css from git tracking (git rm --cached)
- Enhanced package.json scripts for better CSS workflow:
  - postinstall: Auto-builds CSS on npm install
  - build-css:dev: Development build with source maps
  - start: Now builds CSS before starting server
  - dev: Builds CSS before development mode
- Updated README with CSS development documentation
- Explains SCSS organization and build process
- Documents all CSS-related npm scripts

Benefits:
✅ Cleaner repository (no generated files)
✅ Prevents merge conflicts in generated CSS
✅ Automatic CSS generation on new machine setup
✅ Source of truth is SCSS files only
✅ Consistent build process across environments

README.md

@@ -29,6 +29,7 @@ A community-driven web application for tracking winter road conditions and icy h
    ```bash
    npm install
    ```
+   *Note: CSS is automatically built via the `postinstall` script*
 
 3. **Configure environment variables:**
    ```bash
@@ -38,7 +39,9 @@ A community-driven web application for tracking winter road conditions and icy h
 
 4. **Start the server:**
    ```bash
-   npm start
+   npm start          # Production mode
+   npm run dev        # Development mode
+   npm run dev-with-css  # Development with CSS watching
    ```
 
 5. **Visit the application:**
@@ -46,6 +49,22 @@ A community-driven web application for tracking winter road conditions and icy h
    http://localhost:3000
    ```
 
+### CSS Development
+
+This project uses SCSS for styling. The CSS is **generated** and should not be committed to git.
+
+- **Build CSS once:** `npm run build-css`
+- **Build CSS (dev mode):** `npm run build-css:dev` 
+- **Watch CSS changes:** `npm run watch-css`
+- **Dev with CSS watching:** `npm run dev-with-css`
+
+SCSS files are organized in `src/scss/`:
+- `main.scss` - Main entry point
+- `_variables.scss` - Theme variables and colors
+- `_mixins.scss` - Reusable SCSS mixins
+- `pages/` - Page-specific styles
+- `components/` - Component-specific styles
+
 ## Environment Variables
 
 ```bash
@@ -72,7 +91,7 @@ PORT=3000
    ```bash
    git clone git@github.com:deco/ice.git /opt/ice
    cd /opt/ice
-   npm install
+   npm install  # This automatically builds CSS via postinstall
    ```
 
 3. **Configure environment:**