How to disable CSRF checks for html-based forms in Symfony app?

Question

I have this open source Symfony app and I need to disable CSRF checks either globally or at least for some <forms>. Besides 2 methods described below, I also tried removing various lines of code that mention CSRF, but nothing helped.

What I tried:

1. I tried to globally disable CSRF as described here How can I turn of CSRF protection globally on Symfony 3 with FOSUserBundle , but the problem is in my Symfony App there are no .yml files in root/config directory - it only contains: settings.php, default.settings.php, dev.php, prod.php, languages.php, but no .yml/.xml files
2. I tried to disable CSFR for a specific <form> as described here How to disable csrf in symfony? , but the prblem is my <form> is HTML-based, not PHP-based. My Symfony app doesn't create <form>s via PHP.

My Symfony App:

• The app is open-source - repository here: https://github.com/agendav/agendav/tree/develop/web
• In root/app/controllers.php I have this piece of code withCSRF protection ↓↓↓. I tried to remove it, but then form is not even rendered.

...
// Authentication
$app->get('/login', '\AgenDAV\Controller\Authentication::loginAction')->bind('login');
$app->post('/login', '\AgenDAV\Controller\Authentication::loginAction');
$app->get('/logout', '\AgenDAV\Controller\Authentication::logoutAction')->bind('logout');

// CSRF protection
$app->before(function(Request $request, Application $app) {
    return \AgenDAV\Csrf::check($request, $app);
});
...

• The login form template is in root/templates/login.html and it is called inside root/src/controller/Authentication.php:

...
return $app['twig']->render('login.html', $template_vars);
...