site: fix invalid blog rss feed (#2085) and tidy

site/src/routes/blog/rss.xml.js

@@ -4,7 +4,7 @@ const months = ',Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec'.split( ',' );
 
 function formatPubdate(str) {
 	const [y, m, d] = str.split('-');
-	return `${d} ${months[+m]} ${y}`;
+	return `${d} ${months[+m]} ${y} 12:00 +0000`;
 }
 
 const rss = `
@@ -27,7 +27,7 @@ const rss = `
 			<description>${post.metadata.description}</description>
 			<pubDate>${formatPubdate(post.metadata.pubdate)}</pubDate>
 		</item>
-	` )}
+	`).join('')}
 </channel>
 
 </rss>