Remove google analytics support

Google Analytics is one in many options that you can use to track page views,
it's not on our roadmap at the moment.

alchemy/templates/include/google_analytics.html

@@ -1,12 +0,0 @@
-{% if GOOGLE_ANALYTICS_ID %}
-  <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', '{{ GOOGLE_ANALYTICS_ID }}', 'auto');
-    ga('send', 'pageview');
-
-  </script>
-{% endif %}