work around syntaxhighlighter bug causing empty blocks on perlsecret

perlsecret.pod has some code blocks that are very short. The syntax
highlighter has a bug when it attempts to strip <![CDATA[ ]]> blocks,
which ends up entirely erasing short code block content. The CDATA
stripping is only enabled when the useScriptTags option is enabled,
which we don't need or want. Work around the bug by disabling
useScriptTags.

This bug had previously been fixed by patching the vendor library to fix
the CDATA stripping. That change was lost in the conversion to
node_modules.

Author: haarg

root/static/js/syntaxhighlighter.mjs

@@ -85,6 +85,11 @@ SyntaxHighlighter.regexLib['url'] = /[a-z][a-z0-9.+-]*:\/\/[\w-./?%&=:@;#~]*[\w-
 // Use regular spaces, not  
 SyntaxHighlighter.config.space = ' ';
 
+// We aren't using <script type="syntaxhighlighter" />, and when enabled it
+// attempts to strip <![CDATA[ ]]> sections. That code is buggy, and causes
+// breaks on perlsecret.pod
+SyntaxHighlighter.config.useScriptTags = false;
+
 // https://metacpan.org/source/RWSTAUNER/Acme-Syntax-Examples-0.001/lib/Acme/Syntax/Examples.pm
 
 // TODO: Might be easier to do the regexp on the plain string (before
@@ -201,7 +206,8 @@ for (const code of document.querySelectorAll(".content pre > code")) {
         'gutter': false,
         'toolbar': false,
         'quick-code': false,
-        'tab-size': 8
+        'tab-size': 8,
+        'useScriptTags': false,
     };
     for (const className of code.classList) {
         const res = className.match(/(?:\s|^)language-(\S+)/);