Initialise highlighting without jQuery

Nothing against the venerable old library, but it’s only being used here as a loader for the syntax highlighter. This approach will work in everything even remotely modern (IE9+, everything else), and saves 30Kb gzipped plus parsing time on the pages it’s used on.

templates/Header.php

@@ -35,7 +35,6 @@ if(!isset($js)){
 	<meta content="#394451" name="theme-color">
 	<? if($js){ ?>
 	<link href="/js/highlight.js/styles/paraiso-dark.css" rel="stylesheet">
-	<script src="/js/jquery-3.3.1.min.js"></script>
 	<script src="/js/highlight.js/highlight.pack.js"></script>
 	<script src="/js/core.js"></script>
 	<? } ?>

www/js/core.js

@@ -1,9 +1,10 @@
 'use strict';
 
-$(function(){
+document.addEventListener('DOMContentLoaded', function() {
 	if(hljs){
-		$('code.html.full, code.css.full, figure code.html').each(function(i, block) {
-			hljs.highlightBlock(block);
-		});
+		var blocks = document.querySelectorAll('code.html.full, code.css.full, figure code.html');
+		for (var i=0; i<blocks.length; i++) {
+			hljs.highlightBlock(blocks[i]);
+		};
 	}
 });