Remove unused colors from the tailwind config

[zackkrida]

Fixes

Related to #3592 by @fcoveram

Description

While reviewing our tailwind configuration in preparation of #3958, I noticed we still have a number of colors that aren't in use, and one that was incorrectly still in use.

Testing Instructions

Tests should pass.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
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• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (if applicable).

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[sarayourfriend]

LGTM!

[dhruvkb]

LGTM!

[dhruvkb]

Ah yes, the colors from CC times!