feat: add -80 primitive color tokens

[marionnegp]

Added -80 primitive color tokens based on values on Brand's Color page

*Note: Blues might be moved to the "Status palette" section (because it's a link color). Status colors only go up to -70, so we were asked to hold off on adding blue-80.

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Latest commit: b572129

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@rhds/tokens	Minor

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[bennypowers]

is there an -80 for red-orange?

[markcaron]

@bennypowers, no. red-orange, green and blue won't have -80 values. They will be part of a limited palette (mostly for use in statuses and states), and not part of our primary palette.

[markcaron]

Legends Guide; Tokens Manifest