Change many lines

src/lib/components/Header.svelte

@@ -0,0 +1,20 @@
+<script>
+	import Icon from "./Icon.svelte";
+
+  export let title = 'Galerie';
+  export let description = '';
+  /** @type {string | undefined} */
+  export let back = undefined;
+</script>
+
+<header>
+  <section class="title">
+    {#if back}
+      <a href={back}>
+        <Icon name="arrow-left" />
+      </a>
+    {/if}
+    <h1>{title}</h1>
+    <p>{description}</p>
+  </section>
+</header>