feat: hamburger menu on small screens

src/app/nav/nav.ts

@@ -16,5 +16,19 @@ import { RouterLink } from "@angular/router";
   templateUrl: "./nav.html",
 })
 export class Nav {
+  public isMenuOpen = false;
 
+  /**
+   * Toggles the mobile menu open/closed state.
+   */
+  public toggleMenu(): void {
+    this.isMenuOpen = !this.isMenuOpen;
+  }
+
+  /**
+   * Closes the mobile menu.
+   */
+  public closeMenu(): void {
+    this.isMenuOpen = false;
+  }
 }