treewide: migrate to new standalone nixvim design

flake/default.nix

@@ -6,17 +6,17 @@
 }:
 {
   imports = [
-    ./checks.nix
     ./devshell.nix
     ./git-hooks.nix
+    ./nixvim.nix
     ./overlays.nix
     ./pkgs-by-name.nix
     ./treefmt.nix
   ];
 
   perSystem =
     {
-      self',
+      config,
       system,
       ...
     }:
@@ -27,6 +27,6 @@
         config.allowUnfree = true;
       };
 
-      packages.default = self'.packages.khanelivim;
+      packages.default = config.packages.khanelivim;
     };
 }

flake/nixvim.nix

@@ -0,0 +1,44 @@
+{
+  inputs,
+  lib,
+  self,
+  ...
+}:
+{
+  imports = [
+    inputs.nixvim.flakeModules.default
+  ];
+
+  nixvim = {
+    packages = {
+      enable = true;
+      nameFunction = lib.id;
+    };
+    checks = {
+      enable = true;
+      nameFunction = lib.id;
+    };
+  };
+
+  flake.nixvimModules = {
+    default = ../modules/nixvim;
+  };
+
+  perSystem =
+    { system, ... }:
+    {
+      nixvimConfigurations = {
+        khanelivim = inputs.nixvim.lib.evalNixvim {
+          inherit system;
+
+          extraSpecialArgs = {
+            inherit inputs system self;
+          };
+
+          modules = [
+            self.nixvimModules.default
+          ];
+        };
+      };
+    };
+}

modules/nixvim/default.nix

@@ -1,4 +1,4 @@
-{ lib, ... }:
+{ lib, self, ... }:
 let
   inherit (builtins) readDir;
   inherit (lib.attrsets) foldlAttrs;
@@ -22,4 +22,9 @@ in
       ./performance.nix
       ./usercommands.nix
     ];
+
+  nixpkgs = {
+    overlays = lib.attrValues self.overlays;
+    config.allowUnfree = true;
+  };
 }