Updated Intro presentation URL

index.html

@@ -253,7 +253,7 @@
 				<script>
 					var resources = [
 						'<a href="https://www.udacity.com/course/interactive-3d-graphics--cs291" target="_blank"><img src="files/udacity.png" width="121" height="152" /></a>',
-						'<a href="http://davidscottlyons.com/threejs/presentations/frontporch14/" target="_blank"><img src="files/intro.png" width="121" height="106" /></a>'
+						'<a href="http://davidscottlyons.com/threejs-intro/" target="_blank"><img src="files/intro.png" width="121" height="106" /></a>'
 					];
 					document.write( resources[ Math.floor( Math.random() * resources.length ) ] );
 				</script>