Add workflow to deploy to GH pages w/ JupyterLite#2

mfisher87 wants to merge 8 commits intomainjupytercon/jupytercon2025-developingextensions-demo:mainfrom

deploy-to-gh-pagesjupytercon/jupytercon2025-developingextensions-demo:deploy-to-gh-pagesCopy head branch name to clipboard