Update index.html

[Imran-imtiaz48]

Key Adjustments: • Replaced ÷ and × symbols for division and multiplication for better clarity. • Removed duplicated id="0" button. • Minor formatting adjustments for better readability. Ensure your JavaScript (script.js) file handles the calculator logic as discussed earlier, and your CSS (style.css) enhances the visual presentation and responsiveness of your calculator. This setup should provide a solid foundation for a functional and visually appealing calculator application.