Remove from cart functionality

[rushilshakya]

User Story: as a user, when I go to my cart, I should be able to remove an item from the cart

Implementation:

• create a route for remove from cart that will take an artid. get the userid from session. if userid does not exist, then send the appropriate status. get the pending order for userid from order table. then remove artid from the order
• create a reducer component that will dispatch a thunk. if no userid, then remove item from localstorage, and dispatch action to remove from redux also
• create a remove from cart button component that calls the thunk with the artid