Add Next.js ESLint (#425)

* Added Next.js eslint

* added eslint to lint-staged

* Added eslint config for prettier

* Fixed eslint issues in multiple files

* Fixed error in linter

components/cart/CartItem/CartItem.tsx

@@ -70,6 +70,9 @@ const CartItem = ({
     if (item.quantity !== Number(quantity)) {
       setQuantity(item.quantity)
     }
+    // TODO: currently not including quantity in deps is intended, but we should
+    // do this differently as it could break easily
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [item.quantity])
 
   return (