smufl
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Fix contrast accessibility issues
This pull request modifies the colours of the text to meet AAA accessibility guidelines. It also adds a background colour to images in .ayu and .coal themes, though this may have unintended side effects, as the selector is vague.
It has not been tested as a build, and the effects should be viewed by someone that can build the mdBook before merging.
It does not address the other accessibility issues mentioned in #192.