Thebe integration - initial exploration

[stevejpurves]

This PR uses some of the thebe-react providers and hooks to enable thebe in the ArticleV3 component.

https://github.com/C2DH/journal-of-digital-history/assets/1473646/f5ab0001-dcef-4bec-a83b-4f34017dc8bd

Idea here is that we can look at this versus current cell rendering in the JDH article, and better map out what a more complete implementation should look like.

Some points (non exhaustive) to consider are:

• If and how to reset the article to it's original form?
  • UX for showing the article state, if it has been changed
  • disconnecting
• output rendering
  • should we be able to restore original outputs?
  • how should output area behave during execution?
  • current implementation is direct on page only (javascrip outputs?) what priorities should be assigned to magic and iframe outputs?
  • how to appropriately render the output fragment within the current JDH output components? sizing, styling, etc...
• busy state:
  • what does global busy state look like?
  • how should we show individual cell busy state?
• defining test cases:
  • basic static plots
  • ipywidgets
  • others???
• should any configuration controls be exposed to the user for compute? choice of binder? localhost computing?

[stevejpurves]

Reflecting on the discussion points above, I think one of the most important early things to investigate is how thebe is integrated into the current ArticleCell code and to what extent ThebeNotebook/ThebeCell is used in that integration. We should consider the IsMagic and IsolatedRendering cases here.

[stevejpurves]

Brought these changes in, will open a further PR for visibility in on the next iteration