Added improved login and logout route for the frontend. The frontend page now doesn't have to reload.

frontend/src/components/Header.tsx

@@ -1,7 +1,10 @@
 import React from "react";
-import Cookies from "js-cookie";
 
-const Header: React.FC = () => {
+type HeaderProps = {
+  onLogout: () => void;
+};
+
+const Header: React.FC<HeaderProps> = ({ onLogout }) => {
   return (
     <header className="mb-6 md:mb-10">
       <h1 className="text-3xl md:text-4xl font-extrabold text-blue-800 tracking-tight drop-shadow-sm">
@@ -11,12 +14,8 @@ const Header: React.FC = () => {
         Schnell und unkompliziert Equipment reservieren
       </p>
       <button
-        onClick={() => {
-          Cookies.remove("token");
-          localStorage.removeItem("allItems");
-
-          window.location.reload();
-        }}
+        type="button"
+        onClick={onLogout}
         className="text-blue-500 hover:underline"
       >
         Logout