Polish general concept color tables

While reading the General Concept Colors page I found myself distracted by text found in color table diagrams. The most noticeable problem is the text has some minor clipping issues, but I also felt like the tables would be just as informative without text. In addition, the solid color tables looked a bit off-putting compared to other content on the page (especially without text).

I changed the color tables to airbrush dots using Krita. This increases file size by a little bit, and can be detrimental to some readers if I didn't choose good alternative text. That said, I hope these "polished" color tables will help readers understand color concepts faster.