Fix duplicate Flask route and add Statistics link to admin navbar

- Remove duplicate start_games function in routes.py that was causing Flask route conflict
- Add Statistics page link to admin submenu in navbar with chart-bar icon

mbetterclient/web_dashboard/templates/base.html

@@ -142,6 +142,9 @@
                             <li><a class="dropdown-item" href="{{ url_for('main.logs') }}">
                                 <i class="fas fa-file-alt me-1"></i>Logs
                             </a></li>
+                            <li><a class="dropdown-item" href="{{ url_for('main.statistics') }}">
+                                <i class="fas fa-chart-bar me-1"></i>Statistics
+                            </a></li>
                         </ul>
                     </li>
                     {% endif %}