Unused rendermime registry

[saulshanabrook]

It looks like voila creates a rendermime registry and registers jupyter widgets but then never actually uses it to render anything:

• create rendermime registry: https://github.com/voila-dashboards/voila/blob/91fb3ce829e5bd4f8e6962ac5ee5281b3ba6b190/share/jupyter/voila/templates/default/static/main.js#L34
• register jupyter widgets: https://github.com/voila-dashboards/voila/blob/5798a22e49ae50c451ea33098849571148ddfc1a/js/src/manager.js#L33
• do rendering, but don't use rendermime registry: https://github.com/voila-dashboards/voila/blob/5798a22e49ae50c451ea33098849571148ddfc1a/js/src/manager.js#L42-L66

From @SylvainCorlay

hum that is right, we use the widget view script tag at the moment. We used not to in the beginning.

[vidartf]

So do you want to remove the dead code, or to have voila use it? 😉

[SylvainCorlay]

A bit of both on my side. When we move to a jlpm-based template we will certainly use thr rendermime system.