Create 3 new illustrations for color theory concepts

Here is the current lesson

https://www.freecodecamp.org/learn/responsive-web-design-v9/lecture-working-with-colors-in-css/what-is-color-theory-in-design

Back when we had videos, the original hashnode script used some images from wikipedia. Most of those were free to use but these three here are not without attribution

- https://en.wikipedia.org/wiki/Analogous_colors#/media/File:AnalogousColors.png
- https://en.wikipedia.org/wiki/Complementary_colors#/media/File:RGB_color_wheel.svg
- https://commons.wikimedia.org/wiki/File:Triadic_colors.png

We need to go into canva and create new illustrations. It doesn't need to be exactly like those wikipedia ones. But similarly enough so it still conveys the concept to campers.

Then we can add those three illustrations to the cdn repo here and not have to worry about attribution issues.