Allow switching UIs

It would be nice to have a convenient way to switch UIs. So far we have settled on lightdm as display manager, so being able to choose a display manager after the device booted should be possible with a custom greeter. My wishlist for that would look as follows:

make it touch friendly (possibly use kirigami toolkit?)
give it a nice postmarketOS style
auto-login if there is only one UI installed

When we have that, I suggest to create a unified way to bring up the display manager from any UI: #134 (closed)

Edited Jul 18, 2019 by Administrator

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