ci(phpdoc): remove no-op .nojekyll step

upload-pages-artifact v4+ excludes dotfiles from the artifact, so the
touched file never reached the deployment. It was already unnecessary:
artifact-based Pages deploys never run Jekyll.

Author: MarketDataApp

.github/workflows/phpdoc.yml

@@ -35,9 +35,6 @@ jobs:
       - name: Generate Documentation
         run: phpdoc -d ./src -t ./docs
 
-      - name: Ensure .nojekyll
-        run: touch docs/.nojekyll
-
       - name: Configure GitHub Pages
         uses: actions/configure-pages@v6