Add JupyterLite Demo

[bollwyvl]

References

• blocked by Add Documentation hosted on ReadTheDocs #39
• blocked by Make lab extension work without (full) server extension #25
  • some work in progress here Split out server/public rooms and retro into separate plugins #38

Elevator Pitch

Demonstrate using the JupyterLab extension at a stable, predictable URL that loads faster than a binder, but is more ephemeral in its content, and demonstrates round-about "integration" without fully implementing #28 (still desirable for self-hosting).

Tasks

• add jupyterlite to docs environment, build
• add a tour
• add a widget-based link builder notebook
  • JVC-PUBLIC
  • room that uses the public WebRTC signaling server provided by yjs
  • workspace, once supported
  • ???

[bollwyvl]

fixed by #41