fixed redirect to admin login and minor bug

Fixed redirect to the admin page by actually calling the login function.
Also fixed file path of logo in admin.php

pages/login.html

@@ -12,7 +12,7 @@
       <h2>Admin Login</h2>
       <img src="../img/csg.png" width="100" />
     </div>
-    <form id="loginForm">
+    <form id="loginForm" action="../php/login.php" method="post">
       <label for="username">Benutzername</label>
       <input type="text" id="username" name="username" required />
       <label for="password">Passwort</label>
@@ -21,6 +21,6 @@
     </form>
     <p id="errorMsg" style="color: red;"></p>
   </div>
-  <script src="../js/login.js"></script>
+  <!--<script src="../js/login.js"></script>-->
 </body>
 </html>

php/admin.php

@@ -16,7 +16,7 @@ if (!isset($_SESSION["loggedIn"])) {
   <div class="container-dashboard">
     <div class="header-with-image">
       <h2>Admin Dashboard</h2>
-      <img src="img/csg.png" width="100" />
+      <img src="../img/csg.png" width="100" />
     </div>
 
     <a href="../php/logout.php" class="logout-btn">Logout</a>

php/login.php

@@ -4,7 +4,7 @@ session_start();
 $username = $_POST['username'] ?? '';
 $password = $_POST['password'] ?? '';
 
-$usersFile = __DIR__ . "../data/users.json";
+$usersFile = "../data/users.json";
 if (!file_exists($usersFile)) {
     die("Benutzerdaten fehlen!");
 }