readme: adding pembagian tugas

feat: sale, authentications

See merge request if3110-2023-01-i/tugas-besar-1!7

refactor: deleting unused codes, and moving navbar.php to prototype
refactor: prototype directory typo

Merge branch 'dev' of https://gitlab.informatika.org/if3110-2023-01-i/tugas-besar-1 into feat/saleandcart

feat: sell items

feat: image preview and front end on make sale

fix: make-sale.css bug
fix: padding in cart.css
fix: login href to catalog
fix: make-sale styling

fix: cart undefined function
feat: navbar hrefs
fix: navbar css bugs

Merge branch 'dev' of https://gitlab.informatika.org/if3110-2023-01-i/tugas-besar-1 into feat/saleandcart

fix: generalizing logged out catch

feat: base sidebar done

See merge request if3110-2023-01-i/tugas-besar-1!6

feat: make-sale styling

feat: new navbar and cart frontend prototype

See merge request if3110-2023-01-i/tugas-besar-1!5