Hi,
Not sure if I understand your question fully but you can redirect users using an Open Page action button. In there, you can set your On click event to ‘Open link’ and put your URL in there.
You may also use the Deeplinks module from the app store, but that may be overkill for your requirement.
If you want to move to a new website, you’ll want to use either the Open URL action in the Nanoflow Commons module you can find on the Marketplace, or an Open Link button.
https://docs.mendix.com/appstore/modules/nanoflow-commons/
https://docs.mendix.com/studio/page-editor-widgets-buttons/