removed one more reference to the dropbox

presentations/testtwf-how-to-write-a-reftest/index.html

@@ -45,7 +45,7 @@ <h2>Reftest Overview</h2>
 					    <li class="fragment">Test file uses the feature you're testing</li>
 					    <li class="fragment">Reference file is an exact visual match without using the feature you're testing</li>
 						<li class="fragment">Self-describing (works both manually and with automation)</li>
-						<li class="fragment"> Cross-browser & cross-platform</li>
+						<li class="fragment"> Cross-browser &amp; cross-platform</li>
 					</ul>
 					</blockquote>
 				</section>
@@ -72,10 +72,7 @@ <h2>Directory structure</h2>
 						</ul>
 
 					</section>
-					<section>
-					    <img src="assets/images/directoryStructure.png"/>
-					</section>
-    			</section>
+				</section>
 
     			<section>
     				<h2>Sample Test Case</h2>