Revert "redesign + site-wide a11y sweep + lint tooling (#960)" (#962)

This reverts commit 9cf865c.

Author: jeswr

.github/workflows/lint.yml

@@ -8,12 +8,3 @@ _site
 vendor
 rdfa/node_modules
 rdfa/package-lock.json
-node_modules
-.cache
-pa11y-report.json
-
-# Playwright — keep baseline PNGs, ignore only failure/diff artefacts
-test-results/
-playwright-report/
-**/*-actual-*.png
-**/*-diff-*.png