Add entering transition on Shop and fix some styling

- Center intro title vertically
- Cart item styling tweaks
- Add cart button quantity label inside of button so it's clickable

src/components/molecules/CartItem.svelte

@@ -30,7 +30,10 @@
     </div>
     <div class="cart-item__right">
         <h3>Poster</h3>
-        <p>{item.product.name} – {item.price_total}€</p>
+        <p>
+            {item.product.name}
+            <br>– {item.price}€
+        </p>
 
         {#if item && item.quantity}
             <Select