Create a Plymouth theme according to this mockup and these definitions:
https://share.kde.org/index.php/s/FRWAcvz7sqZ6Mth
Like the grub theme the redesign is aimed towards minimizing bright colours.
So the redesign is a black background. That means that we will go with
simplistic styles and elegance more than anything in the design language. In
this case clean light grey (#eff0f1) monochrome icons and a clear text also
light grey is chosen with good spacing between the two.
Details Pending: a simple animation for the monochrome icons, with a
placeholder "Plasma Icon" used as standard and made first. For this to happen
the new Plasma icon must be chosen.