I'm starting a new project with Yii2 based on the default example-Welcome-to-yii page. In this example-project, the css file from web/css/site.css is loaded.
But looking in index.php views/layout/main.php, views/site/index.php an the related controller/action, I can't find the place, where the site.css is registered. So how to remove the registration in order to remove that file?