extract hamburger to own file

apps/marketing/src/components/(marketing)/mobile-hamburger.tsx

@@ -0,0 +1,18 @@
+import { Menu, X } from 'lucide-react';
+
+import { Button } from '@documenso/ui/primitives/button';
+
+export interface HamburgerMenuProps {
+  isMenuOpen: boolean;
+  menuToggle: () => void;
+}
+
+export const HamburgerMenu = ({ isMenuOpen, menuToggle }: HamburgerMenuProps) => {
+  return (
+    <div className="flex md:hidden">
+      <Button variant="default" className="z-20 w-10 p-0" onClick={menuToggle}>
+        {isMenuOpen ? <X /> : <Menu />}
+      </Button>
+    </div>
+  );
+};