Add new templates for user authentication and management

- Created `unlogged-layout.php` and `unlogged.php` for the login page layout.
- Implemented `main-view.php` for system update management with progress tracking.
- Added `user-2fa.php` for two-factor authentication verification.
- Developed `user-edit.php` for editing user details and privileges.
- Introduced `users-list.php` for displaying and managing user accounts.
- Added `.htaccess` configuration for URL rewriting and security settings.

autoload/admin/view/class.Page.php

@@ -7,9 +7,13 @@ class Page {
   {
 		global $user;
 
+    if ( $_GET['module'] == 'user' && $_GET['action'] == 'twofa' ) {
+      return \admin\controls\Users::twofa();
+    }
+
 		if ( !$user || !$user['admin'] )
 			return \admin\view\Users::login_form();
-    
+
     $tpl = new \Tpl;
     $tpl -> content = \admin\Site::route();
     return $tpl -> render( 'site/main-layout' );