refactor(webapp): remove extra mobile menu implementation from landing page component

- Removed the mobile menu button and its associated functionality from the landing page component.
- Cleaned up the code to enhance maintainability and readability.
- This change simplifies the component by eliminating unused features.

Author: dalenguyen

webapp/src/app/components/landing-page.component.ts

@@ -131,72 +131,6 @@ import { AnalyticsService } from '../services/analytics.service'
               <span class="ml-1 bg-blue-500 text-white text-xs px-1.5 py-0.5 rounded-full">BETA</span>
             </a>
           </div>
-
-          <!-- Mobile Menu Button -->
-          <button
-            class="md:hidden text-gray-600 focus:outline-none hover:text-blue-600 transition duration-300"
-            (click)="toggleMobileMenu()"
-            aria-label="Toggle menu"
-          >
-            <svg
-              xmlns="http://www.w3.org/2000/svg"
-              class="h-6 w-6"
-              fill="none"
-              viewBox="0 0 24 24"
-              stroke="currentColor"
-            >
-              <path
-                *ngIf="!isMobileMenuOpen()"
-                stroke-linecap="round"
-                stroke-linejoin="round"
-                stroke-width="2"
-                d="M4 6h16M4 12h16M4 18h16"
-              />
-              <path
-                *ngIf="isMobileMenuOpen()"
-                stroke-linecap="round"
-                stroke-linejoin="round"
-                stroke-width="2"
-                d="M6 18L18 6M6 6l12 12"
-              />
-            </svg>
-          </button>
-        </div>
-
-        <!-- Mobile Menu -->
-        <div
-          *ngIf="isMobileMenuOpen()"
-          [@mobileMenuAnimation]
-          class="md:hidden mt-3 border-t border-gray-200 pt-3"
-        >
-          <div class="flex flex-col space-y-3">
-            <a
-              href="#features"
-              class="text-gray-600 hover:text-blue-600 transition duration-300 py-1"
-              (click)="closeMobileMenu()"
-              >Features</a
-            >
-            <a
-              href="#about"
-              class="text-gray-600 hover:text-blue-600 transition duration-300 py-1"
-              (click)="closeMobileMenu()"
-              >About</a
-            >
-            <a
-              href="#contact"
-              class="text-gray-600 hover:text-blue-600 transition duration-300 py-1"
-              (click)="closeMobileMenu()"
-              >Contact</a
-            >
-            <a
-              routerLink="chat"
-              class="text-blue-600 hover:text-blue-800 transition duration-300 flex items-center py-1"
-              (click)="closeMobileMenu()"
-              >
-              <span>Chat</span>
-              <span class="ml-1 bg-blue-500 text-white text-xs px-1.5 py-0.5 rounded-full">BETA</span>
-            </a>
-          </div>
         </div>
       </nav>