Feat: Refactor jsonld & method to update document title and description (#4)

* Generates JSON ld structured metadata from a product & appends to head

* Updated IProduct & IVariation interface

* Added IProductResponse & IProductsResponse interfaces

* Fixed sitemap urls having to many protocols

* Implemented jsonld for product w/ variations

* Aligned Product responses between backend & frontend

* PageMeta for updating head meta values: title & description

Use on any page where we want to display a unique meta page title &
description

* Set document language to norwegian

* Linting

src/routes/checkout/+page.svelte

@@ -1,14 +1,13 @@
 <script lang="ts">
   import OrderSection from './OrderSection.svelte';
   import DeliverySection from './DeliverySection.svelte';
+  import PageMeta from '$lib/components/PageMeta.svelte';
   import CheckoutButton from '$lib/components/Button.svelte';
   import StripeCard from '$lib/components/StripeCard.svelte';
   import ApplePayButton from '$lib/components/ApplePayButton.svelte';
   import VippsHurtigkasse from '$lib/components/VippsHurtigkasse.svelte';
   import { cart } from '$lib/cartStore';
 
-  import type { IProduct } from '$lib/interfaces/IProduct';
-
   function postOrder(event: any) {
     const formData = new FormData(event.target);
 
@@ -35,6 +34,11 @@
   }
 </script>
 
+<PageMeta
+  title="Kasse"
+  description="Kasse for bestilling og betaling av produkter i handlekurven"
+/>
+
 <h1>Checkout</h1>
 <form class="checkout" on:submit|preventDefault="{postOrder}">
   <section id="delivery">