feat: add images for color theory lesson

build/curriculum/lecture-transcripts/attributions.md

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+lecture-what-is-color-theory-in-design-8.png CC BY-SA 3.0 Analogous color scheme by Trond Grøntoft https://en.wikipedia.org/wiki/Analogous_colors#/media/File:AnalogousColors.png
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+lecture-what-is-color-theory-in-design-9.png CC BY-SA 3.0 RGB Color Wheel with complementary colors by DanPMK https://en.wikipedia.org/wiki/Complementary_colors#/media/File:RGB_color_wheel.svg
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+lecture-what-is-color-theory-in-design-10.png Creative Commons Attribution-Share Alike 4.0 International license. Triadic colors by Weegaweek https://commons.wikimedia.org/wiki/File:Triadic_colors.png