a bit more opengraph stuff

index.html

@@ -6,7 +6,8 @@
     <meta property="og:title" content="Matzo Playground" />
     <meta property="og:type" content="website" />
     <meta property="og:url" content="https://gdritter.com/mtz.html" />
-    <meta property="og:image" content="https://gdritter.com/imgs/matzo-logo.png" />
+    <meta property="og:image" content="https://gdritter.com/imgs/matzo-title.png" />
+    <meta property="og:description" content="Matzo: a programming language for random text" />
 
     <meta charset="utf-8">
     <script type="text/javascript">