* reconciles latest color variables from Figma
* defines the primary colors and the color system in tailwind config.
* refines how we generate utilities within the color system for `bg`, `fg` and `border`.
* removes custom box shadows, instead leaning on direct definition in CSS and `theme()`.
This change removes duplicate color information being defined as CSS variables in `index.css`
and co-locates all style information with the component
whilst retaining the ability to tie in to the color system when mapping styles from Figma.
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