feat(lsp): setup nix.

lsp/nixd.lua

@@ -0,0 +1,20 @@
+return {
+  settings = {
+    nixd = {
+      nixpkgs = {
+        expr = "import (builtins.getFlake(toString ./.)).inputs.nixpkgs { }",
+      },
+      formatting = {
+        command = {"alejandra"},
+      },
+      options = {
+        nixos = {
+          expr = "let flake = builtins.getFlake(toString ./.); in flake.nixosConfigurations.skadi.options",
+        },
+        home_manager = {
+          expr = "let flake = builtins.getFlake(toString ./.); in flake.homeConfigurations.skadi.options",
+        },
+      },
+    },
+  },
+}

lua/plugins/lsp.lua

@@ -1,5 +1,9 @@
 return {
   {
     "neovim/nvim-lspconfig",
+    config = function()
+
+      vim.lsp.enable("nixd")
+    end,
   },
 }