added git link to header

Author: hakimel

index.html

@@ -13,12 +13,14 @@
 		<header>
 			<a href="http://hakim.se/experiments/404">About this experiment</a>
 
+			<a href="https://github.com/hakimel/404">Fork on GitHub</a>
+			
 			<div class="facebook-button">
 				<iframe src="http://www.facebook.com/plugins/like.php?href=http%3A%2F%2Fhakim.se%2Fexperiments%2Fhtml5%2F404&amp;layout=button_count&amp;show_faces=false&amp;width=90&amp;action=like&amp;font=arial&amp;colorscheme=light&amp;height=21" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:90px; height:21px;" allowTransparency="true"></iframe>
 			</div>
 
 			<div class="tweet-button">
-				<a href="http://twitter.com/share" class="twitter-share-button" data-text="A creepy 404 page created @hakimel." data-url="http://hakim.se/experiments/html5/404" data-count="horizontal" data-related="hakimel"><script type="text/javascript" src="http://platform.twitter.com/widgets.js"></script></a>
+				<a href="http://twitter.com/share" class="twitter-share-button" data-text="A creepy 404 page created by @hakimel." data-url="http://hakim.se/experiments/html5/404" data-count="horizontal" data-related="hakimel"><script type="text/javascript" src="http://platform.twitter.com/widgets.js"></script></a>
 			</div>
 		</header>