Console color palette

[pierrephz]

Summary

Set up the colors for the new console

Changes

• Create a new file colors.styl to store the base colors.
• Remove old color tokens in generic.styl.
• Create new color tokens in this generic.styl with new color bases and explanation for each.

Notes for Reviewers

We will have to link all the new colors. I am available for a coding session if needed cc @ryaplots

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Compatibility: The changes are backwards compatible with existing API, storage, configuration and CLI, according to the compatibility commitments in README.md for the chosen target branch.
• Documentation: Relevant documentation is added or updated.
• The steps/process to test this feature are clearly explained including testing for regressions.
• Changelog: Significant features, behavior changes, deprecations and fixes are added to CHANGELOG.md.
• Commits: Commit messages follow guidelines in CONTRIBUTING.md, there are no fixup commits left.

[kschiffer]

I've added a couple of commits which will:

• Add token definitions as CSS variables
• Add new utility classes that are based on the design tokens
• Refactor the entire codebase to use CSS variables for colors
• Refactor the entire codebase to use new utility classes based on design tokens
• Remove many (now) unused variable and style definitions as well as mixins

After merging this PR, we will use the token CSS variables only as well as respective utility classes.