feat(nvim): Move neovim config to a sub-flake

neovim/flake.nix

@@ -0,0 +1,47 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    systems.url = "github:nix-systems/default";
+    nixvim = {
+      url = "github:nix-community/nixvim";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    nnn = {
+      url = "github:nix-community/neovim-nightly-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    nvim-devdocs.url = "github:luckasRanarison/nvim-devdocs";
+    nvim-devdocs.flake = false;
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    systems,
+    nixvim,
+    nnn,
+    ...
+  } @ inputs: let
+    forEachSystem = nixpkgs.lib.genAttrs (import systems);
+    nvim = forEachSystem (system:
+      import ./nvim.nix {
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = import ./overlays.nix {
+            inherit inputs;
+          };
+        };
+      });
+  in rec {
+    packages = forEachSystem (system: rec {
+      neovim = nvim.${system}.neovim;
+      default = neovim;
+    });
+    overlays = {
+      default = prev: final: {
+        sneovim = packages.${final.system}.neovim;
+      };
+    };
+  };
+}