Add Katex support for displaying math

templates/partials/head.html

@@ -9,6 +9,22 @@
 	{%- endif %}
 	<title>{% include "partials/title.html" %}</title>
 	<link rel="canonical" href="{{ current_url | default(value='/') | safe }}" />
+	
+	{%- if config.extra.katex %}
+	<link rel="stylesheet" href="{{ get_url(path="katex.css") }}">
+	<script defer src="{{ get_url(path="katex.js")}}"></script>
+	<script defer src="{{ get_url(path="auto-render.js") }}"></script>
+	<script>
+		document.addEventListener("DOMContentLoaded", function() {
+			renderMathInElement(document.body, {
+				delimiters: [
+					{left: "$$", right: "$$", display: true},
+					{left: "$", right: "$", display: false},
+				]
+			});
+		});
+	</script>
+	{%- endif %}
 
 	{%- if config.markdown.highlight_code and config.markdown.highlight_theme == "css" %}
 		{%- if config.markdown.highlight_themes_css | length > 0 %}