Manual layout in demo generate invalid html

Hi! Trying to set manual layout but can't do it, manual layout demo - https://github.com/atk4/ui/blob/develop/demos/layout/layouts_manual.php just duplicates <html> inside main <body> container, creating invalid html result, and that is not what expected (but that html looks as it works).

Also - demo site down https://ui.atk4.org/demos/ 502
