Add forgot password feature

app/Controller/Auth.php

@@ -2,8 +2,6 @@
 
 namespace Kanboard\Controller;
 
-use Gregwar\Captcha\CaptchaBuilder;
-
 /**
  * Authentication controller
  *
@@ -61,21 +59,6 @@ class Auth extends Base
         $this->response->redirect($this->helper->url->to('auth', 'login'));
     }
 
-    /**
-     * Display captcha image
-     *
-     * @access public
-     */
-    public function captcha()
-    {
-        $this->response->contentType('image/jpeg');
-
-        $builder = new CaptchaBuilder;
-        $builder->build();
-        $this->sessionStorage->captcha = $builder->getPhrase();
-        $builder->output();
-    }
-
     /**
      * Redirect the user after the authentication
      *