add matomo, slim down a few lines

layouts/partials/matomo.html

@@ -0,0 +1,14 @@
+<!-- Piwik -->
+<script type="text/javascript">
+  var _paq = _paq || [];
+  _paq.push(['trackPageView']);
+  _paq.push(['enableLinkTracking']);
+  (function() {
+    var u="//mehl.mx/";
+    _paq.push(["setTrackerUrl", u+"piwik.php"]);
+    _paq.push(["setSiteId", "9"]);
+    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.php"; s.parentNode.insertBefore(g,s);
+  })();
+</script>
+<!-- End Piwik Code -->