remove analytics

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

_includes/head.html

@@ -34,16 +34,5 @@
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-
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-      ga('set', 'anonymizeIp', true);
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-
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     <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>