Replace katex header in root

Author: jbangelo

katex-header.html

@@ -0,0 +1,15 @@
+<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.22/dist/katex.min.css" integrity="sha256-GQlRJzV+1tKf4KY6awAMkTqJ9/GWO3Zd03Fel8mFLnU=" crossorigin="anonymous">
+<script src="https://cdn.jsdelivr.net/npm/katex@0.16.22/dist/katex.min.js" integrity="sha256-6NiFUFlJ86X0q91d0NU2lr0Tca0m/79PMQ3Nd8jNrok=" crossorigin="anonymous"></script>
+<script src="https://cdn.jsdelivr.net/npm/katex@0.16.22/dist/contrib/auto-render.min.js" integrity="sha256-u1PrlTOUUxquNv3VNwZcQkTrhUKQGjzpFGAdkyZ1uKw=" crossorigin="anonymous"></script>
+<script>
+    document.addEventListener("DOMContentLoaded", function() {
+        renderMathInElement(document.body, {
+            delimiters: [
+                {left: "$$", right: "$$", display: true},
+                {left: "\\(", right: "\\)", display: false},
+                {left: "$", right: "$", display: false},
+                {left: "\\[", right: "\\]", display: true}
+            ]
+        });
+    });
+</script>