fix: add author url in Google JSON-LD conditionally

Author: satnaing

src/layouts/Layout.astro

@@ -43,7 +43,7 @@ const structuredData = {
     {
       "@type": "Person",
       name: `${author}`,
-      url: `${profile}`,
+      ...(profile && { url: profile }),
     },
   ],
 };