undefined check for link.link, remove heroImage

src/pages/handbook/index.astro

@@ -93,7 +93,6 @@ const posts = (await getCollection('handbook')).sort(
 						posts.map((post) => (
 							<li>
 								<a href={`/handbook/${post.slug}/`}>
-									<img width={720} height={360} src={post.data.heroImage} alt="" />
 									<h4 class="title">{post.data.title}</h4>
 									<p class="date">
 										<FormattedDate date={post.data.pubDate} />