modify nn perofmance image

Author: aishaeldeeb

slides/introduction.html

@@ -174,7 +174,7 @@ <h3> Components of a Neural Network</h3>
 
 		<section>
 			<h3> Why use Neural Networks over simple ML models?</h3>
-			<img height="300px" data-src="https://i.stack.imgur.com/TE5n7.png" alt="The participants menu">
+			<img height="300px" data-src="https://i.sstatic.net/TE5n7.pngm" alt="The participants menu">
 			<p> Source: Stack Exchange </p>
 			<aside class="notes">
 				<p>