chore(ci): remove dead CNAME fallback from publish job

CNAME is now copied into dist/ by the build driver on production builds
(see Task 1 of this PR), so the workflow no longer needs to restore it.
The fallback was dead anyway — it referenced $../CNAME which does not
exist because the publish job doesn't check out the source repo.

Author: danielnaab

.github/workflows/deploy.yml

@@ -112,9 +112,6 @@ jobs:
             mkdir -p "$(dirname "$rel")"
             cp -r ../dist "$rel"
           fi
-          if [ ! -f CNAME ]; then
-            cp ../CNAME . 2>/dev/null || true
-          fi
 
       - name: Commit and push gh-pages
         working-directory: gh-pages-work