Change site routing in yii2?

Question

Yii

The question is how to do routing is an old site with static pages. For example, there is an old address argoncredit.com/whyargon (we installed yii2 and we need to make this address open via the same link, but roughly speaking on yii2).
How can I make it so that, for example, a request to /whyargon opens the Controller "site" Page name

public function actionWhyargon   ()
    {

    }

Answer 1

'/<controller:\w+>/<action:[a-z0-9-]+>' => '<controller>/<action>'