MAPG-235 go back to start button added to the end of the challenge

views/game.php

@@ -57,6 +57,7 @@
             <button id="continueButton" class="fullWidth">Continue</button>
             <button id="showSummaryButton" class="fullWidth">Show summary</button>
             <button id="startNewGameButton" class="fullWidth">Play this map again</button>
+            <a href="/" id="goToStart"><button class="fullWidth">Go back to the menu</button></a> 
         </div>
     </div>
     <div id="navigation" class="circleControl">