enable mathjax

Author: rlaker

_config.yml

@@ -307,6 +307,7 @@ defaults:
       comments: # true
       share: false
       related: true
+      mathjax: true
   # _pages
   - scope:
       path: ""

_includes/scripts.html

@@ -26,3 +26,20 @@
     <script src="{{ script | relative_url }}"></script>
   {% endfor %}
 {% endif %}
+
+<script type="text/javascript" async
+   src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.6/MathJax.js?config=TeX-MML-AM_CHTML">
+ </script>
+
+ <script type="text/x-mathjax-config">
+    MathJax.Hub.Config({
+      extensions: ["tex2jax.js"],
+      jax: ["input/TeX", "output/HTML-CSS"],
+      tex2jax: {
+        inlineMath: [ ['$','$'], ["\\(","\\)"] ],
+        displayMath: [ ['$$','$$'], ["\\[","\\]"] ],
+        processEscapes: true
+      },
+      "HTML-CSS": { availableFonts: ["TeX"] }
+    });
+ </script>