Update MathJax config to support both dollar sign and LaTeX math syntax

Author: shivamkumar-kimbal

docs/.overrides/assets/javascripts/extra.js

@@ -1,8 +1,8 @@
 // Configure MathJax for pymdownx.arithmatex
 window.MathJax = {
   tex: {
-    inlineMath: [["\\(", "\\)"]],
-    displayMath: [["\\[", "\\]"]],
+    inlineMath: [["$", "$"], ["\\(", "\\)"]],
+    displayMath: [["$$", "$$"], ["\\[", "\\]"]],
     processEscapes: true,
     processEnvironments: true
   },