Create a stable binder

[ianhi]

trafficstars

Based on the discussion above, it sounds like it would still make sense to also provide a "stable" Binder that would install ipywidgets from conda forge or PyPI. As an example the jupyterlab repo Binder badge points to https://github.com/jupyterlab/jupyterlab-demo which uses released packages, and also has the Binder link setup on PRs to test changes in dev mode.

Originally posted by @jtpio in https://github.com/jupyter-widgets/ipywidgets/issues/2701#issuecomment-797477574

[vidartf]

I see such a binder link in the readme now, so I'm closing this. Let me know if I misunderstood :)

[vidartf]

Ah yes, I see the "stable" one is 7.x branch, not released packages. Sorry for jumping the gun!