add markdown formatting with code support

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

@@ -1,5 +1,6 @@
 <script lang="ts">
 	import { resolve } from '$app/paths';
+	import 'highlight.js/styles/github-dark.css';
 
 	let { data } = $props();
 </script>
@@ -17,5 +18,7 @@
 		{/if}
 	</div>
 	<p class="mb-6 text-sm text-gray-500">{data.blogArticle.createdAt?.toDateString()}</p>
-	<div class="whitespace-pre-wrap">{data.blogArticle.content}</div>
+	<div class="prose prose-neutral max-w-none">
+		{@html data.contentHtml}
+	</div>
 </article>