[0.8.0] Demo pyodide-kernel PR 275

[bollwyvl]

References

• previous attempt Demo pyodide-lock PR 269 #1893
• pulls hot wheels from [0.8] Add pyodide-lock.json customization with optional pyodide-lock and uv dependencies pyodide-kernel#275
  • forward-port of [0.7.x] Add pyodide-lock.json customization with optional pyodide-lock and uv dependencies pyodide-kernel#269

Code changes

• examples
  • use pyodide-lock
  • remove a bunch of %pip
  • update the pyhon-packages.ipynb a bit, just for demo

    • not on this PR, but might be fun to do a little interactive of the lockfile with some of the demo widget libs

User-facing changes

• site users will see less %pip
• labextension packages should stay better synced with in-kernel python packages

Backwards-incompatible changes

• n/a

[github-actions]

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