Colors page: Update static content to show tokens

[andrew-ronaldson]

This page does not point to the latest Design tokens and requires additional changes to explain the semantic layer vs base vs palette.

[andrew-ronaldson]

One thing I noticed was that all the swatches seem to point to black.

[edonehoo]

This can probably also be closed by https://github.com/patternfly/patternfly-org/pull/4143, except that PR is only linking to tokens docs -- it doesn't explain token layers on its own. But that could be integrated

[nicolethoen]

@andrew-ronaldson or @lboehling do you want anything else added to the color page before GA release?

[andrew-ronaldson]

Closed by https://github.com/patternfly/patternfly-org/pull/4143