flake: remove helpers module arg

Not to be confused with the Nixvim-configuration `helpers` module arg,
remove the flake-parts `helpers` module arg.

flake/dev/tests.nix

@@ -1,14 +1,10 @@
-{
-  self,
-  helpers,
-  ...
-}:
+{ self, ... }:
 {
   perSystem =
     { pkgs, ... }:
     let
       tests = pkgs.callPackage ../../tests {
-        inherit helpers self;
+        inherit self;
       };
     in
     {

flake/lib.nix

@@ -6,11 +6,6 @@
   ...
 }:
 {
-  # Expose lib as a flake-parts module arg
-  _module.args = {
-    helpers = self.lib.nixvim;
-  };
-
   # Public `lib` flake output
   flake.lib = {
     nixvim = lib.makeOverridable ({ lib }: (lib.extend self.lib.overlay).nixvim) {

flake/nixvim-configurations.nix

@@ -1,9 +1,9 @@
-{ helpers, ... }:
+{ self, ... }:
 {
   perSystem =
     { system, ... }:
     {
-      nixvimConfigurations.default = helpers.modules.evalNixvim {
+      nixvimConfigurations.default = self.lib.evalNixvim {
         inherit system;
       };
     };

flake/packages.nix

@@ -1,9 +1,4 @@
-{
-  self,
-  inputs,
-  helpers,
-  ...
-}:
+{ self, inputs, ... }:
 {
   perSystem =
     {
@@ -18,7 +13,6 @@
 
       packages = import ../docs {
         nixvim = self;
-        inherit helpers;
         inherit system;
         inherit (inputs) nixpkgs;
         inherit (inputs') nuschtosSearch;