This JupyterLite site carries no workshops of its own. It opens a workshop named by a launch link, so a link such as
.../lab/index.html?reset&workshop=https://gist.github.com/<owner>/<id>&restart=force
fetches that workshop into the browser and starts it. The Python the site provides is fixed by its address, so a link keeps working as it was written when newer sites are published alongside.
See the documentation for publishing a workshop that opens here.