Listing page where you view a specific listing

[BriboSD]

Create a listing page you can navigate to by clicking a listing on the homepage. This page will allow users to view the full details about the listing, such as full item description, the user who posted it, etc. Users should then have the option to either press a button to buy the item or enter a different amount of money they wish to bid on the item. For now, these different options don't necessarily have to do anything, but in the future, we can consider adding a value to the listing schema which says if it has been bought or not, and the item can stop being listed on the homepage.