The legacy "Deploy from a branch" Pages build ran Jekyll on every push to
main and failed on the planning docs under /docs — Jekyll's Liquid parser
hit `Unknown tag 'data'` in EVALUATION_PLAN.md, so the website build went
red after nearly every commit.
/docs is a hand-written static site (index.html + robots/sitemap/llms.txt),
so it never needed Jekyll. Deploy it with a GitHub Actions workflow that
uploads /docs as-is and only triggers on docs/** changes, and add a
.nojekyll guard. Switch the Pages source to "GitHub Actions" for this to
take over from the legacy build.
Co-authored-by: DeusData <joerge@datadice.io>