[DDW-604] Use createShades util in createTheme to generate 3 shades of background color
[DDW-604] Use createShades util in createTheme to generate 3 shades of background color

input-output-hk/daedalus,input-output-hk/daedalus,input-output-hk/daedalus,input-output-hk/daedalus,input-output-hk/daedalus,input-output-hk/daedalus