update bring back old flickr image and update jpgs to be 48x48

css/footer.css

@@ -32,7 +32,7 @@ button.social#tw {
 }
 
 button.social#flickr {
-    background: url('../icons/flickr.jpg');
+    background: url('../icons/flickr.png');
     background-size: cover;
     background-color: #fff;
 }