Update Hatter Style Guide and Theme to use Default Colors
>>> [!note] Migrated issue
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<!-- Migrated from issue #3188969. -->
Reported by: [brianperry](https://www.drupal.org/user/2304500)
>>>
<p>Complete work to make theme toggleable via css custom properties, and set default back to evergreen Midcamp theme colors. Work in progress PR in Hatter style guide here: <a href="https://github.com/MidCamp/hatter-v2/pull/19">https://github.com/MidCamp/hatter-v2/pull/19</a></p>
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