Remove old UA analytics slug (#1940)

Signed-off-by: Chris Abraham <[email protected]>

Author: cjyabraham

_includes/head.html

@@ -34,7 +34,6 @@
   <script src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML" type="text/javascript"></script>
   <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js"></script>
   {% if jekyll.environment == 'production' %}
-    {% include analytics.html %}
     {% include pixel.html %}
     {% include twitter_pixel.html %}
   {% endif %}