Added alejandra for formatting

Formatted all files in repo and set up alejandra to run automatically
when nix files are saved.

config/plugins/lsp.nix

@@ -1,4 +1,4 @@
-{
+{pkgs, ...}: {
   plugins.lsp = {
     enable = true;
     servers = {
@@ -19,7 +19,13 @@
       ocamllsp.enable = true;
 
       # nix
-      nixd.enable = true;
+      nixd = {
+        enable = true;
+        settings.formatting.command = ["${pkgs.alejandra}/bin/alejandra"];
       };
     };
+  };
+
+  plugins.lsp-format.enable = true;
+  plugins.lsp-lines.enable = true;
 }

flake.nix

@@ -7,8 +7,11 @@
     flake-parts.url = "github:hercules-ci/flake-parts";
   };
 
-  outputs =
-    { nixvim, flake-parts, ... }@inputs:
+  outputs = {
+    nixvim,
+    flake-parts,
+    ...
+  } @ inputs:
     flake-parts.lib.mkFlake {inherit inputs;} {
       systems = [
         "x86_64-linux"
@@ -17,9 +20,11 @@
         "aarch64-darwin"
       ];
 
-      perSystem =
-        { pkgs, system, ... }:
-        let
+      perSystem = {
+        pkgs,
+        system,
+        ...
+      }: let
         nixvimLib = nixvim.lib.${system};
         nixvim' = nixvim.legacyPackages.${system};
         nixvimModule = {
@@ -31,8 +36,7 @@
           };
         };
         nvim = nixvim'.makeNixvimWithModule nixvimModule;
-        in
-        {
+      in {
         checks = {
           # Run `nix flake check .` to verify that your config is not broken
           default = nixvimLib.check.mkTestDerivationFromNixvimModule nixvimModule;