v0.63.1

Documentation housekeeping in the shipped handbook, checked against the handbook rules the team wrote for itself.

Every one of the 56 pages gained the two transport fields it was missing, and the twelve start pages gained their slug line, without which an imported start page would take the slug "readme" and every area would collide on it. The top-level start page had the wrong page type, two pages claimed the same order, two diagrams ran horizontally where the rule is upright, and two alt texts still described three review states instead of four.

German and English were checked page for page and are identical in structure; every finding appeared in both and is fixed in both.

Nothing needs doing on update.