Add canonical link

site/layouts/partials/head.html

@@ -20,6 +20,7 @@
     <link rel="stylesheet" href="/res/css/monokai.css">
     <link rel="stylesheet" href="/res/css/font-awesome.min.css">
     <link rel="stylesheet" href="/res/css/lightbox.min.css">
+    <link rel="canonical" href="{{ .Permalink }}" />
     {{ if .RSSLink }}
       <link href="{{ .RSSLink }}" rel="alternate" type="application/rss+xml" title="{{ .Site.Title }}" />
     {{ end }}