added buttons on Products page and home screen

[Amitooo1]

I've added 'Buy Now' and 'Add to Cart' buttons to the product pages, ensuring they align with the website's theme and maintain good color contrast for accessibility. Fixes #55

This pull request introduces 'Buy Now' and 'Add to Cart' buttons that are visually consistent with the website's design and optimized for various screen sizes.

My code follows the style guidelines of this project I have performed a self-review of my code I have commented my code, particularly in hard-to-understand areas My changes generate no new warnings New and existing unit tests pass locally with my changes