Move Shop store into separate file

src/components/layouts/PosterLayout.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
     import { capitalizeFirstLetter } from '$utils/functions'
-    import { cartId, cartData } from '$utils/store'
+    import { cartId, cartData } from '$utils/stores/shop'
     import { addNotification } from '$utils/notifications'
     // Components
     import Button from '$components/atoms/Button.svelte'
@@ -20,6 +20,7 @@
         lastPreviewPhoto = product.photos_preview[product.photos_preview.length - 1].directus_files_id
     }
 
+    // Images sizes
     const photosPreview = [
         {
             sizes: {