Add Matomo analytics code

docs/_includes/head.html

@@ -128,4 +128,23 @@
         </script>
         <!-- End AddThis -->
     {% endif %}
+
+
+    <!-- Matomo -->
+    <script type="text/javascript">
+      var _paq = _paq || [];
+      /* tracker methods like "setCustomDimension" should be called before "trackPageView" */
+      _paq.push(["setDoNotTrack", true]);
+      _paq.push(['trackPageView']);
+      _paq.push(['enableLinkTracking']);
+      (function() {
+        var u="//analytics.depau.eu/";
+        _paq.push(['setTrackerUrl', u+'piwik.php']);
+        _paq.push(['setSiteId', '3']);
+        var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
+        g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s);
+      })();
+    </script>
+    <noscript><p><img src="//analytics.depau.eu/piwik.php?idsite=3&amp;rec=1" style="border:0;" alt="" /></p></noscript>
+    <!-- End Matomo Code -->
 </head>