refactor: Use PostList in tag

src/routes/tag/[slug]/+page.svelte

@@ -1,9 +1,9 @@
 <script lang="ts">
 	import type { PageData } from './$types';
+	import PostList from '$lib/components/PostList.svelte'
+	import siteMetadata from '$content/metadata.json';
 	export let data: PageData;
 	const { name, posts } = data;
-	import siteMetadata from '$content/metadata.json';
-	import PostHeader from '$lib/components/PostHeader.svelte';
 </script>
 
 <svelte:head>
@@ -11,19 +11,9 @@
 </svelte:head>
 
 <h1>{name} ({posts.length})</h1>
-
 <hr class="separator" />
-<ul id="catalog" class="content">
-	{#each posts as post}
-		<li>
-			<PostHeader post={post}/>
-		</li>
-	{/each}
-</ul>
+<PostList {posts}/>
 <hr class="separator" />
 
 <style>
-	#catalog li {
-		margin-bottom: 10px;
-	}
 </style>