Fix broken avatars in footer.

Author: anselmh

Diff for: img/anselm.jpg

@@ -220,7 +220,7 @@ <h2>License</h2>
 					<li>
 						<a href="https://twitter.com/drublic"
 								title="Follow @drublic on Twitter">
-							<img src="https://twitter.com/api/users/profile_image/drublic?size=bigger">
+							<img src="img/drublic.jpg">
 						</a>
 						<a href="http://drublic.de/">Hans Christian Reinl</a>
 
@@ -231,7 +231,7 @@ <h2>License</h2>
 					<li>
 						<a href="https://twitter.com/helloanselm"
 								title="Follow @helloanselm on Twitter">
-							<img src="https://twitter.com/api/users/profile_image/helloanselm?size=bigger">
+							<img src="img/anselm.jpg">
 						</a>
 						<a href="http://helloanselm.com/">Anselm Hannemann</a>