Replace docs site with the new interactive help-flow site

The old mkdocs-based docs site's full history is preserved in the
old-version branch (and as this merge's second parent, so it stays
reachable from main too) -- this commit just points main's tree at
the new site going forward. No content lost, nothing force-pushed.
This commit is contained in:
jonwise committed 2026-09-05 09:33:14 -04:00
commit d2c679bb5d

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