remove analytics

per discussion in 2020 on the steering council list
https://groups.google.com/u/1/g/jupyter-steering/c/7j7F0lyQY84/m/Ch9Qj9nMAAAJ

Author: ivanov

_includes/head.html

@@ -34,16 +34,5 @@
         <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
         <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
     <![endif]-->
-    <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-52617120-1', 'auto', {'storage': 'none'});
-      ga('set', 'anonymizeIp', true);
-      ga('send', 'pageview');
-
-    </script>
     <script>console.log('Welcome to Project Jupyter! Explore the various tools available and their corresponding documentation. If you are interested in contributing to the platform, please visit the community resources section at https://jupyter.org/community.html.')</script>
 </head>