Remove phoenix layout from tutorial project

[APB9785]

In a previous version, the tutorial project GUI would fill the whole browser window. Currently it is rather small inside the default Phoenix layout. Ideally we get rid of the layout and return to the full-size display

[ruan-brandao]

I did some tests locally and got to remove the default layout and leave the game area on full width, this worked well when using the browser in full screen without the toolbar, but otherwise the game area would go over the fold making the full area not visible.

Test on full screen without browser toolbar

Test on browser not on full screen with toolbar

I also got to make the game screen bigger, while keeping the authorization links and keeping it playable when not of full screen.

Bigger game area, but not on full width

WDYT is the best approach here?