Add tailwind migration document#4888

MrBra1nwash wants to merge 1 commit intomastertoptal/picasso:masterfrom

CPS-2685-investigate-the-scope-of-tailwind-v3-=-v4-upgradetoptal/picasso:CPS-2685-investigate-the-scope-of-tailwind-v3-=-v4-upgradeCopy head branch name to clipboard