Add functionality to the Underbar

[Ben-Tewfik]

Task title
Add functionality to the Underbar

Task description
The UnderBar component in the Navbar displays category links, but they lack functionality. This issue aims to enhance the UnderBar by adding functionality to the category links. The goal is to make these links interactive so that when a user clicks on a category link, it navigates to the "Products" page, displaying only the products associated with the selected category.

Subtasks

• Pass Category as Query Parameter.
• Update the "Products" Page to Accept Category Query.
• Test Navigation.