Update Open Graph and Twitter image metadata

src/app.html

@@ -5,10 +5,10 @@
 		<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no" />
 		<meta property="og:locale" content="en_US" />
 		<meta property="og:site_name" content="Kuzu" />
-		<meta property="og:image" content="https://kuzudb.com/img/kuzu-logo.png" />
+		<meta property="og:image" content="https://kuzudb.com/img/kuzu_logo_icon_800px.png" />
 		<meta property="og:type" content="article" />
 		<meta name="twitter:card" content="summary" />
-		<meta property="twitter:image" content="https://kuzudb.com/img/kuzu-logo.png" />
+		<meta property="twitter:image" content="https://kuzudb.com/img/kuzu_logo_icon_800px.png" />
 		<meta name="twitter:site" content="@kuzudb" />
 		<meta name="description" content="Kuzu is an embedded graph database that supports the Cypher query language. Built by a team of database experts with a relentless drive towards performance, scalability and usability, Kuzu offers a state-of-the-art query processor for graphs and is the ideal foundation for your graph-based analytical applications.">