Remove sed from workflow step

.github/workflows/update_site.yml

@@ -67,14 +67,10 @@ jobs:
           "chmod -R 777 /srv/jekyll && jekyll build --incremental --future"
 
       # Build the lab part of the site using JupyterLite
-      #   the sed command replaces faulty code in JupyterLite that prevents using
-      #   it when installed in the user's home space
-      #   see https://github.com/jupyterlite/jupyterlite/discussions/1136
       - name: Build the lab site with JupyterLite
         working-directory: jupyterlite
         run: |
           mkdir -p ../_site/notebooks/
-          sed -i -e 's/ENV_EXTENSIONS = Path(sys.prefix) \/ SHARE_LABEXTENSIONS/ENV_EXTENSIONS = Path('\/home\/ubuntu\/.local\/share\/jupyter\/labextensions\/')/g' ~/.local/lib/python3.11/site-packages/jupyterlite_core/addons/federated_extensions.py
           jupyter lite build --contents notebooks --output-dir ../_site/notebooks
 
       # Ready and upload artifact for deployment