Implement basic login function; add basic styling

src/Dependencies.php

@@ -4,7 +4,8 @@ declare(strict_types=1);
 namespace MailAccountAdmin;
 
 use DI\Container;
-use MailAccountAdmin\Login\LoginController;
+use MailAccountAdmin\Frontend\Login\LoginController;
+use MailAccountAdmin\Frontend\Dashboard\DashboardController;
 use PDO;
 use Psr\Container\ContainerInterface;
 use Slim\Views\Twig;
@@ -47,13 +48,20 @@ class Dependencies
             );
         });
 
-        // Login, registration, authentication
+        // Login page
         $container->set(LoginController::class, function (ContainerInterface $c) {
             return new LoginController(
                 $c->get(self::TWIG)
             );
         });
 
+        // Dashboard
+        $container->set(DashboardController::class, function (ContainerInterface $c) {
+            return new DashboardController(
+                $c->get(self::TWIG)
+            );
+        });
+
         return $container;
     }
 }