Mobile fixes to The Forum Doesn't Remember

A beat-by-beat browser sweep of The Forum Doesn't Remember, and Doesn't Cumulate (formerly Somewhere to Put It) turned up four collisions. Three were phone-only: the "rooted in an actual place" cards in the two timeline stages sat on top of one another, and the "is necessary for" label on the goal-tree stage ran off the right edge. The fourth was on the desktop layout — a caption grew over the diagram at middling widths — and was fixed by tightening the prose rather than moving it. The superseded story/ draft that this piece replaced has also been removed from the repo.