Add login page styles and refactor authentication views

- Introduced new styles for the login page, enhancing layout and responsiveness.
- Updated the login view to utilize the new styles and improve user feedback for login errors and success messages.
- Removed unused controllers and views related to contact and login functionalities to streamline the codebase.
- Adjusted error message handling in the AuthController for better clarity on password requirements.

Controller/AuthController.php

@@ -76,7 +76,7 @@ class AuthController
         }
 
         if ($this->pwRequirementCheck($data['password'])) {
-            $errors
+            $errors['password'] = "Passwort muss mindestens 8 Zeichen lang sein und mindestens ein Großbuchstabe, ein Kleinbuchstabe, eine Zahl und ein Sonderzeichen enthalten.";
         }
 
         if (empty($errors)) {