Add footer component to rules page

Inserted the `<app-footer>` component to the rules page template. This ensures consistency in the layout by including the footer across all pages. No additional logic or styles were modified.

frontend/src/app/rules/rules.component.html

@@ -260,4 +260,5 @@
       <p style="display: none;">Scroll Down</p>
     </a>
   </main>
+  <app-footer></app-footer>
 </ng-container>