Interface for the first run [AppImage]

[mayrinck]

Hey guys, I've created this interface for you to consider using in the initial interface of the appimage, which now only displays the DPI settings.

My idea improves upon that by additionally showing the status of the installation prefix and the DPI settings. I see that this could be extended to be a config tool that a user can start whenever needed to reconfigure/update their installation or DPI settings. For now, I did these screens for you guys to check out and use if you'd like the idea.