remove tracking from docs

docs/_templates/layout.html

@@ -1,20 +0,0 @@
-{% extends "!layout.html" %}
-
-{% block footer %}
-{{ super() }}
-<!-- Piwik -->
-<script type="text/javascript">
-  var _paq = _paq || [];
-  _paq.push(['trackPageView']);
-  _paq.push(['enableLinkTracking']);
-  (function() {
-    var u="//piwik.beerfactory.org/";
-    _paq.push(['setTrackerUrl', u+'piwik.php']);
-    _paq.push(['setSiteId', 6]);
-    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="//piwik.beerfactory.org/piwik.php?idsite=6" style="border:0;" alt="" /></p></noscript>
-<!-- End Piwik Code -->
-{% endblock %}