Katex Java script added

Author: vivekkpatel

docs/javascripts/katex.js

@@ -0,0 +1,10 @@
+document$.subscribe(({ body }) => { 
+  renderMathInElement(body, {
+    delimiters: [
+      { left: "$$",  right: "$$",  display: true },
+      { left: "$",   right: "$",   display: false },
+      { left: "\\(", right: "\\)", display: false },
+      { left: "\\[", right: "\\]", display: true }
+    ],
+  })
+})