Update index.html

Author: robot-colosseum

index.html

@@ -226,7 +226,7 @@ <h2 class="title is-3">Abstract</h2>
           </p>
           <h2>Leaderboard on THE COLOSSEUM</h2>
           <div style="text-align: center;">
-              <img src="media/main.png" alt="Description of the image" style="width: 70%; height: auto;">
+              <img src="media/f1.png" alt="Description of the image" style="width: 70%; height: auto;">
           </div>
         </div>
       </div>