Add newline before stat title in GH summary

Author: Kobzol

site/src/github.rs

@@ -654,7 +654,7 @@ async fn summarize_run(
 
     for (title, stat, hidden, comparison) in stats {
         message.push_str(&format!(
-            "## [{title}]({})\n",
+            "\n## [{title}]({})\n",
             make_comparison_url(&commit, stat)
         ));