docs: add JupyterLab integration docs

[renan-r-santos]

What do you guys think about the Binder link? My idea was to help people who want to do a quick test of using Pixi + JupyterLab before adopting it.

[dhirschfeld]

I always preferred manually specifying my kernels with conda/mamba rather than using nb_conda_kernels. It should be possible to do the same with pixi without any magic (though some people do prefer the magic!).

Manually creating a jupyter kernelspec like the below should do the job for people who like doing it the hard way! 😅

{
  "argv": [
    "pixi", "run", "--manifest-path", "~/pixi/envs/dev312",
    "python", "-m", "ipykernel_launcher",
    "-f", "{connection_file}"
  ],
  "display_name": "dev312",
  "language": "python",
  "env": {
    "A_VARIABLE": "true",
  },
  "metadata": {
    "debugger": true
  }
}

[ruben-arts]

Nice that you already add this!

[renan-r-santos]

I'm converting this to a draft for now. I released a new version of pixi-kernel and now it is capable of supporting in theory any other Jupyter kernels. It already supports Python, R, Bash and C++.
I need to update this PR to reflect that and also address some comments from Wolf. I'll let you guys know when this is ready for review again. Tks.

[renan-r-santos]

@ruben-arts @wolfv I believe this is ready for another pass.
pixi-kernel 0.2.0 added support for additional kernels, such as R, C++ and Bash. I updated the pixi-kernel section accordingly and added a few words on when you might want to use it.

[wolfv]

Thanks @renan-r-santos!