languages/nix: add nixd to supported LSP servers

[Elias-Ainsworth]

Add nixd as a possible lsp for nix.

Sanity Checking

• I have updated the changelog as per my changes.
• I have tested, and self-reviewed my code.
• Style and consistency
  • I ran Alejandra to format my code (nix fmt).
  • My code conforms to the editorconfig configuration of the project.
  • My changes are consistent with the rest of the codebase.
• If new changes are particularly complex:
  • My code includes comments in particularly complex areas
  • I have added a section in the manual.
  • (For breaking changes) I have included a migration guide.
• Package(s) built:
  • .#nix (default package)
  • .#maximal
  • .#docs-html
• Tested on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin

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[NotAShelf]

Mostly LGTM.

Left a few comments for consistency, if you could also add an entry to the changelogs this should be good to go.

[NotAShelf]

Almost forgot, please rebase on the v0.7 branch as main is currently supposed to be in a feature freeze.

[diniamo]

There is a reaoson we didn't already have nixd, so we should be a little more cautious about merging this. I think some features rely on LSP settings (which the user can't configure until the rewrite).

[Elias-Ainsworth]

I submitted a pr for the rebased commit. Should I close this one considering it may be unecessary?

[diniamo]

You could've just pushed that to this branch, and set the target branch to v0.7 (which I would still prefer to preserve comments).

[Elias-Ainsworth]

You could've just pushed that to this branch, and set the target branch to v0.7 (which I would still prefer to preserve comments).

Sorry...I'm a little stupid