meta description

layouts/partials/head.html

@@ -10,6 +10,10 @@
     {{ with .Site.Params.homeMetaContent }}
       <meta name="description" content="{{ . | plainify }}">
     {{ end }}
+  {{ else }}
+    {{ $summary := trim (.Summary | plainify | htmlUnescape) "\n\r"
+      | default .Title }}
+    <meta name="description" content="{{ $summary }}">
   {{ end }}
 
   <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">