ADD sidebar and REFACTOR buttons

frontend/src/components/Topbar.tsx

@@ -0,0 +1,19 @@
+import { Menu, X} from 'lucide-react';
+import MenuButton from "./buttons/MenuButton.tsx";
+
+type props = {
+    sidebarToggled: boolean,
+    setSidebarToggled: Function
+}
+
+const Topbar = ({sidebarToggled, setSidebarToggled}: props) => {
+    return (
+        <div>
+            <MenuButton onClick={() => setSidebarToggled(!sidebarToggled)}>
+                {sidebarToggled ? <X size={24}/> : <Menu size={24}/>}
+            </MenuButton>
+        </div>
+    )
+}
+
+export default Topbar;