Added auth to navbar to decide what should be displayed

frontend/src/components/Navbar.js

@@ -1,6 +1,7 @@
 import React, { useState, useEffect } from "react";
 import { Button } from "./Button";
 import { Link } from "react-router-dom";
+import { useAuth } from "../auth/AuthProvider";
 import "./Navbar.css";
 import "@fortawesome/fontawesome-free/css/all.css";
 
@@ -57,6 +58,11 @@ function Navbar() {
                 Anleitung
               </Link>
             </li>
+            {isLoggedIn ? (
+              console.log("Eingeloggt")
+            ): (
+              console.log("Nicht eingeloggt")
+            )}
             <li>
               <Link
                 to="/login"