Mention installation commands using Pixi

[paugier]

Currently Spyder is quite broken when installed via Pixi global install (spyder-ide/spyder#25399).

However, in the long term, this looks like an interesting tool to install an application distributed with conda-forge.

Therefore, when it's going to work, it would be nice to mention how to install Spyder with Pixi in https://docs.spyder-ide.org/current/installation.html (full installation and light installation like with conda).

For the light installation, I think this should work

pixi global install spyder

For the full installation, I don't exactly know what should be used. Maybe something like

pixi global install spyder -e spyder-env --with numpy scipy pandas matplotlib sympy cython

which gives

└── spyder-env (installed)
    ├─ dependencies: spyder 6.1.2, scipy 1.17.0, pandas 3.0.0, matplotlib 3.10.8, sympy 1.14.0, cython 3.2.4, numpy 2.4.2
    └─ exposes: spyder, isympy, cygdb, cython, cythonize

or

pixi global install spyder -e spyder-env --expose spyder --with numpy scipy pandas matplotlib sympy cython

giving just

└── spyder-env (installed)
    ├─ dependencies: spyder 6.1.2, scipy 1.17.0, pandas 3.0.0, matplotlib 3.10.8, sympy 1.14.0, cython 3.2.4, numpy 2.4.2
    └─ exposes: spyder

[ccordoba12]

Thanks for reporting @paugier. We'll try to address this after we solve the problem with running a kernel for global installations.