Poor colorblind mode

[BananaObserved]

The current colorblind setting changes the green to orange and lightens the red. This makes the text harder, not easier, for me to read with my red-green colorblindness; the text is still clearly readable, but the contrast between the two sections is lower, which leads to the page seeming more like a wall of text.

[stanislowskij]

This now corresponds to Clojure-Intro-Course/babel#51 in the migration repository.