Based on last commit in Git.
And some random formatting and copyediting fixes. See also #1708
* A compact, fixed box in the right screen * Only for big screens, > 1200 px wide
ref
relref
- Rejigged the weight of the extras/ content for the new crossreferences page. - Used the new {{</*…*/>}} format for documenting highlighting and to prevent a warning about the missing `fig` shortcode.