Pajlow

@capsia37 made some designs we could use as a start. https://github.com/ubports/ubports-installer/pull/1552#issuecomment-934736910 Maybe we can still have some moving stuff as a background layer.

> Regarding any future GUI planning, i realized this also needs to be done per OS, as if you flash anything else than Ubuntu Touch, it should not show Ubuntu...

@amartinz I think we should have another release before the slide show is included. The particles are really causing heavy CPU load.

Hi there :wave:, did a dialog show asking to enter an unlock code?