Replace header image with smaller file

Replaced header image with a smaller file to reduce load times and bandwith consumption, especially for mobile users. Closes #7.

Author: trynthink

css/main.css

@@ -333,7 +333,7 @@ pre {
 
 .search-section {
   width: 100%;
-  background: url(../img/33837_crop.jpg);
+  background: url(../img/33837_crop3.jpg);
   background-size: cover;
   height: 500px;
   color: white; }