fix twitter card type

audon-fe/index.prod.html

@@ -11,6 +11,7 @@
 
     <!-- Facebook Meta Tags -->
     <meta property="og:type" content="website">
+    <meta name="twitter:card" content="summary">
     <meta property="og:site_name" content='{% printf "Audon hosted on %s" .Config.LocalDomain %}'>
     <meta property="og:image" content='{% printf "https://%s/static/opengraph.80fbb63d.png" .Config.LocalDomain %}'>
     <meta property="og:image:width" content='1200'>