Deprecate the classic notebook extension

[jtpio]

This will be a follow-up issue to #69

The idea is to reuse the same components as the ones used for the JupyterLab Extension, by having a standalone lab-based app that shoes the notebook and the editor only. The helps share the same code base and workflows between the lab extension and the classic notebook extension.

This is done in jupyterlab/retrolab#69 in https://github.com/voila-dashboards/voila-gridstack/tree/0d5c9e3504c3d48a3aed004ea64528b7ea905fea/packages/gridstack-editor, and looks like the following:

The remaining items would be to:

• Bundle the standalone app in the distribution, for example under voila-gridstack/editor or voila-gridstack/static directly
• Add a button to the classic notebook UI to open the standalone app in a new browser tab
• Remove the classic notebook extension

[jtpio]

Thinking we might want to start deprecating the classic notebook extension as part of the 0.3.x series.

Not sure whether we should provide the standalone editor as mentioned above. Users could just use JupyterLab instead.

Another option would be to see whether we want to make the current JupyterLab extension compatible with RetroLab.

[hbcarlos]

I was thinking the same. I would like to make this extension compatible with retrolab instead of using the standalone app.

We need to have two documents open to drag and drop cells from the notebook to the grid. Maybe we could create a map view of the notebook on a side panel?

[jtpio]

Yes. Probably RetroLab will start exposing the left and right areas at some point: https://github.com/jupyterlab/retrolab/issues/268

These areas will be hidden by default. With menu entries to show them on demand.

[hbcarlos]

We can start adding the widget to JupyterLab (sometimes it is helpful to open the grid editor without the notebook), and later we can easily create the extension for RetroLab.

These areas will be hidden by default. With menu entries to show them on demand.

I suppose will be a command to open them, so, we can always execute the command when opening the grid editor.

[jtpio]

We can start adding the widget to JupyterLab (sometimes it is helpful to open the grid editor without the notebook),

By "widget" this means the notebook mini-map? If so that sounds good, and it could go either to the left or right area.

I suppose will be a command to open them

Most likely yes.