Dev

fix: adding catch for logged out user in adding items to cart
fix: cart access queries
feat: add2cart front end scripts
feat: cart page
fix: catalog empty search bar catch
feat: cart stylings

fix: quantity editor styling
feat: quantity editor script
feat: quantity editor on make-purchase.php

feat!: clicking an item from catalog redirect to make-purchase.php
feat: item_query.php
fix(catalog.js): inner html of items, deleting unnecessary function
fix: request method of item
feat: db+mock sql schema
fix: specifying navbar style
fix!: restyling login page
fix!: catalog display as grid
feat!: make-purchase styling

merge to main

merge: dev branch to main

See merge request if3110-2023-01-i/tugas-besar-1!8

readme: adding pembagian tugas