投稿一覧のグリッドをarticle要素に変更

src/routes/(DefaultStyle)/[slug]/+page.svelte

@@ -15,11 +15,11 @@
 <div class='contain'>
 	<div class="posts">
 		{#each data.posts as post}
-			<div class="post" class:unpublished={!post.metadata.published}>
+			<article class="post" class:unpublished={!post.metadata.published}>
 				<a style='text-decoration: none;' href="../post/{post.postId}" tabindex="0">
 					<Postgrid id={post.postId} {...post.metadata}></Postgrid>
 				</a>
-			</div>
+			</article>
 		{/each}
 		{#if data.posts.length%4}
 			{#each Array(4-data.posts.length%4) as i}