Fix deploy-github-page.yml

Author: mcbarton

.github/workflows/deploy-github-page.yml

@@ -86,9 +86,10 @@ jobs:
           micromamba create -n xeus-lite-host jupyterlite-core
           micromamba activate xeus-lite-host
           python -m pip install jupyterlite-xeus
-          mv $GITHUB_WORKSPACE/notebooks dist
-          mv $GITHUB_WORKSPACE/README.md dist
           jupyter lite build --XeusAddon.prefix=${{ env.PREFIX }} --output-dir dist
+          mkdir -p dist/files
+          mv notebooks dist/files
+          mv README.md dist/files
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3