Update default.html

Author: ahwind

_layouts/default.html

@@ -44,7 +44,7 @@
     </script>
 
     <script type="text/javascript"
-       src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
+       src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
     </script>
 
 </head>