update style

_includes/head.html

@@ -24,21 +24,6 @@
     hljs.initHighlightingOnLoad()
   </script>
 
-  <!-- MathJax -->
-  <script type="text/x-mathjax-config">
-    MathJax.Hub.Config({
-      tex2jax: {
-      inlineMath: [['$','$'], ['\\(','\\)']],
-      displayMath: [['$$','$$'], ['\[','\]']],
-      processEscapes: false,
-      processEnvironments: false,
-      skipTags: ['script', 'noscript', 'style', 'textarea', 'pre', 'a']
-    }
-  });
-  </script>
-  <script type="text/javascript" async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.2/MathJax.js?config=TeX-AMS_SVG">
-  </script>
-
   <!-- Share -->
   <script defer src="https://connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.8" id="facebook-jssdk"></script>
   <script defer src="https://platform.twitter.com/widgets.js" id="twitter-wjs"></script>