fix(nix): drop none-ls formatter

[Mic92]

nixd already provides formatting builtin:

https://github.com/nix-community/nixd/blob/2c25600cb9c91bc06fe8676c044814dc30435274/nixd/docs/configuration.md?plain=1#L62

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Does this PR follow the [Contribution Guidelines](development guidelines)? Following is a partial checklist:

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[Uzaaft]

We are currently avoiding nixfmt until it becoms stable. See the tracking issue: #883

[Mic92]

We have nixfmt in 24.11, so it is stable? Also this doesn't replace alejandra it let nixd handle the configuration. People can still configure nixd to use alejandra. It just sets the default.

[Uzaaft]

We have nixfmt in 24.11, so it is stable? Also this doesn't replace alejandra it let nixd handle the configuration. People can still configure nixd to use alejandra. It just sets the default.

My PR sets the formatter as alejandra.As for the stability of nixfmt, check their github repo. They call it not yet stable. :)

[Mic92]

We have nixfmt in 24.11, so it is stable? Also this doesn't replace alejandra it let nixd handle the configuration. People can still configure nixd to use alejandra. It just sets the default.

My PR sets the formatter as alejandra.As for the stability of nixfmt, check their github repo. They call it not yet stable. :)

If nixd is active this doesn't work because nixd does the formatting not non-ls. So this is a no-op. Same is true for nil-ls. This pull request is not about alejandra vs nixfmt. You can still use alejandra after that.