New: the visual roadmap

The roadmap is now an actual map: boxes, edges, a spine with branches β€” roadmap.sh-style β€” with every box clickable and colour-coded by build status. Green is written, amber is in progress, grey is planned. So it's simultaneously the learner's path and the site's honest public to-do list.

The bit we're pleased with: the map is a plain-text JSON file in the repo, and the picture is generated from it by a small script. Change the data, regenerate, done. Hand-drawn diagrams rot (we found a gorgeous 2023 mind-map of this very project that no tool can update); generated ones track the content. Plain text wins again, which is sort of the site's whole point.

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