FEATURES : viewsCustomer.py

- [ ] ability to change the quantity in the cart(dropdown)
- [ ] Add `branch_id` in `Products` table(change models.py, option for search by branch, change APIs and routes accordingly, search based on branch_id(right now only have one branch)) 
- [ ] promo codes for specific customers
- [ ] Add recently added products on the customer dashboard
- [ ] Style fixes on the product details page
