feat: calendar-course-cell-color-picker (#157)

* feat: calendar-course-cell-color-picker done??

* fix: ensure hex code is lowercase

* fix: make hex codes lower case

* chore: convert px to rem in ColorPatch.tsx

* fix: add functionality to the invert colors button

* fix: some more lowercase stuff

* fix: remove hardcoded color patch hex codes, remove hardcoded pixel values

* chore: remove React.FC

* chore: modify docs

* fix: remove duplicate style

* fix: used name over size specified classes

* fix: grid over flex, elie feedback

* refactor: use color strings instead of indices

* refactor: remove console.log statements

src/shared/util/themeColors.ts

@@ -12,7 +12,6 @@ export const colors = {
         offwhite: '#D6D2C4',
         concrete: '#95A5A6',
         red: '#B91C1C', //   Not sure if this should be here, but it's used for remove course, and add course is ut-green
-        white: '#FFFFFF',
     },
     theme: {
         red: '#AF2E2D',