Add RemoveItemFromBasket method to IBasketService and BasketService

[kdowswell]

This pull request primarily introduces a new feature that allows users to remove items from their shopping basket. Additionally, it includes changes to the web page layout to accommodate this new feature, a change to the database configuration, and the addition of unit tests for the new functionality.

Feature addition:

• src/ApplicationCore/Entities/BasketAggregate/Basket.cs: Added a RemoveItem method to the Basket class that allows items to be removed from the basket by their catalog item ID.
• src/ApplicationCore/Interfaces/IBasketService.cs: Extended the IBasketService interface with a RemoveItemFromBasket method.
• src/ApplicationCore/Services/BasketService.cs: Implemented the RemoveItemFromBasket method in the BasketService class. This method removes an item from a given user's basket and updates the basket in the repository.
• src/Web/Pages/Basket/Index.cshtml.cs: Added a OnPostRemove method to the IndexModel class that removes an item from the basket when the "Remove" button is clicked on the web page.

Web page layout changes:

• src/Web/Pages/Basket/Index.cshtml: Made changes to the layout of the basket page to include a "Remove" button for each item in the basket. [1] [2] [3] [4]

Database configuration change:

• src/Infrastructure/Dependencies.cs: Changed the useOnlyInMemoryDatabase variable to true in the ConfigureServices method. This means that an in-memory database will be used regardless of the configuration setting.

Unit tests:

• tests/UnitTests/ApplicationCore/Entities/BasketTests/BasketRemoveItem.cs: Added unit tests for the RemoveItem method in the Basket class.