Adjustments to the katex integration, part 2.

assets/js/math.js

@@ -0,0 +1,21 @@
+/**
+ * @file
+ * A JavaScript file for Katex auto renderer.
+ */
+
+(function () {
+
+  'use strict';
+
+  document.addEventListener('DOMContentLoaded', function () {
+    // eslint-disable-next-line no-undef
+    renderMathInElement(document.body, {
+      delimiters: [
+        {left: '$$', right: '$$', display: true},
+        {left: '$', right: '$', display: false}
+      ],
+      throwOnError: false
+    });
+  });
+
+})();