Add pinned section back to guides

Will be working on another multi-part guide, and this
is the best way to seperate them for the time being.

guides/index.html

@@ -32,6 +32,10 @@
 		<main>
 			<section>
 
+				<h2>Pinned</h2>
+				<ul>
+					<li><a href="/guides/guide-to-server-hosting.html">Guide to server hosting</a></li>
+				</ul>
 				<h2>2022</h2>
 				<ul>
 					<li><a href="/guides/password-protect-webpage.html">Password protect webpages</a> - (WIP)14/09/2022</li>