Platform Redesign: Update color palette in ui-base

[jayjayjpg]

We should update our color palette in ui-base to the latest redesign

In a first iteration, we can update our existing color modifiers to use the designated tailwind color codes.

New Colors

Names	Hex
slate-100, gray-900 (with light contrast color)	#111827
slate-20 (with dark contrast color)	#D6D7D9
forest-100, teal-900	#134E4A
sky-100, cyan-500	#06B6D4
canary-100, yellow-400	#FBBF24
saffron-100, red-600	#DC2626
plum-100, purple-600	#9333EA
frost-100, gray-300 gray-500	#D1D5DB #6B7280
white-100, white	#ffffff
verdant-100, teal-700	#0F766E

[jayjayjpg]

I changed the following colors due to too low-color contrast on white backgrounds:

before	after
frost-100, gray-300 #D1D5DB	frost-100, gray-500 #6B7280
https://webaim.org/resources/contrastchecker/?fcolor=D1D5DB&bcolor=FFFFFF	https://webaim.org/resources/contrastchecker/?fcolor=6B7280&bcolor=FFFFFF