Archivist: add color palettes for styles

[karmatosed]

This is an issue to start creating the color palettes for each default theme and styles.

The idea is to have a style per default theme and starting with color schemes is a good place to begin.

[MaggieCabrera]

Let's open different PRs for each variation:

• Twenty Twenty-Four
• Twenty Twenty-Three
• Twenty Twenty-Two
• Twenty Twenty-One
• Twenty Twenty
• Twenty Nineteen
• Twenty Seventeen
• Twenty Sixteen
• Twenty Fifteen
• Twenty Fourteen
• Twenty Thirteen
• Twenty Twelve
• Twenty Eleven
• Twenty Ten