Remove deprecated Google Analytics snippet

Signed-off-by: Daniele Ricci <[email protected]>

site/_includes/head.html

@@ -30,14 +30,4 @@
 
 <title>{{ page.title }} - {{ site.title }}</title>
 
-<script>
-(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-    (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-    m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
-
-ga('create', 'UA-51309577-1', 'mignololab.org');
-ga('send', 'pageview');
-</script>
-
 </head>