Website: Added third-party tutorial for Pug template (#3459)

Author: webdiscus

index.html

@@ -301,7 +301,7 @@ <h1>Third-party tutorials</h1>
 		<li><a href="https://betterstack.dev/blog/code-highlighting-in-react-using-prismjs/">Code highlighting in React using Prism.js</a></li>
 		<li><a href="https://www.akashmittal.com/react-native-prismjs-using-webview/">Using Prism.js in React Native</a></li>
 		<li><a href="https://itsmycode.com/prismjs-tutorial/">PrismJS Tutorial | Implement Prism in HTML and React</a></li>
-
+		<li>Code syntax highlighting in Pug with <a href="https://webdiscus.github.io/pug-loader/pug-filters/highlight.html">:highlight</a> and <a href="https://webdiscus.github.io/pug-loader/pug-filters/markdown.html">:markdown</a> filters using <a href="https://github.com/webdiscus/pug-loader">pug-loader</a> and Prism.js</li>
 	</ul>
 
 	<p>Please note that the tutorials listed here are not verified to contain correct information. Read at your risk and always check the official documentation here if something doesn’t work :)</p>