USER STORY: One Item Purchase

[Dima-Bulavenko]

As a user I want **to purchase a single item directly from the product and product list pages ** so that I can quickly buy a specific product without adding it to the cart.

Acceptance criteria

1. Provide a “Buy Now” button on the product detail page that initiates the checkout process directly for that item.
2. Ensure clicking “Buy Now” redirects the user to the checkout page with the selected item pre-loaded.
3. Allow users to review the item details and total price on the checkout page before finalizing the purchase.
4. Provide options for users to enter shipping and billing information and select a payment method.
5. Send a confirmation email with order details to the user upon successful purchase.
6. Ensure the "Buy Now" feature is responsive and functions smoothly on both desktop and mobile devices.
7. Display a success message and order summary after the purchase is complete.

[Dima-Bulavenko]

I have created buttons for one-item purchase. I delete them and mark this commit with this tag "one-item-button"