Marginal Color Mismatch to Scratch

[hallpell]

I was working with a student who complained that the colors of Events/Control are swapped between Scratch and Woof. In Scratch, Events is lighter than control, while in Woof the opposite is true. (I suspect Scratch changed their color scheme when they went from Scratch 2.0 to Scratch 3.0). I initially thought this would be a simple fix (just change the color values in docs.css), but we also have screenshots of the Scratch blocks in the documentation that will require a little bit of effort to replace.

The main friction for this is reproducing (i.e. re-screenshot from modern Scratch) and replacing the .pngs currently in /docs/images/. (I personally would probably also want to reorganize this directory to split out images intended for users (sprites and backgrounds) into a separate directory from images used for the Woof UI, but if we're not planning on modifying these images very much going forward it's probably not worth it).

The current Scratch color scheme is: Events: #FFD500 Control: #FFAB19 Data: #FF8C1A