docs: keep the timeline face's design history, not its engine

Six prototypes from the world-face work, kept as the record of how the design got to where it is. The first five are self-contained; prototype 6 and the option-A pages load the engine, so they read here but do not run here.

The engine stays out on purpose. It carries the list of places I travel to, with coordinates, and this repo is published — a design record is not worth publishing that for. The README says how to copy the modules in locally to run prototype 6, and gitignore keeps such a copy from being committed by accident.

Dropping the prototype test target with it: the engine and its tests now live in one place, so the suite runs once rather than twice over identical files.

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