fixed missing png in carousel

Author: Emaasit

Diff for: index.html

@@ -200,7 +200,7 @@ <h4>A List of ggplot2 extensions</h4>
           <!-- Wrapper for slides -->
           <div class="carousel-inner" role="listbox">
             <div class="item active" data-slide="0">
-              <img class="main-screenshot" src="images/carousel-ggiraph.png">
+              <img class="main-screenshot" src="images/carousel-ggtech.png">
               <div class="carousel-caption">
               </div>
             </div>