feat: change neovim flake, add nixcommunity cache

flake.nix

@@ -1,22 +1,32 @@
 {
   description = "NVIM Configuration";
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-24.05";
+    # nixpkgs.url = "github:nixos/nixpkgs/nixos-24.05";
     flake-utils.url = "github:numtide/flake-utils";
-    neovim = {
-      url = "github:neovim/neovim/stable?dir=contrib";
-      inputs.nixpkgs.follows = "nixpkgs";
+    neovim-nightly-overlay = {
+      url = "github:nix-community/neovim-nightly-overlay";
+      # inputs.nixpkgs.follows = "nixpkgs";
     };
   };
+
+  nixConfig = {
+    trusted-substituters = [
+      "https://nix-community.cachix.org"
+    ];
+    extra-trusted-public-keys = [
+      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+    ];
+  };
+
   outputs = inputs @ {
     nixpkgs,
     flake-utils,
-    neovim,
+    neovim-nightly-overlay,
     ...
   }:
     flake-utils.lib.eachDefaultSystem (system: let
       overlayFlakeInputs = prev: final: {
-        neovim = neovim.packages.${system}.neovim.overrideAttrs (oa: {
+        neovim = neovim-nightly-overlay.packages.${system}.default.overrideAttrs (oa: {
           nativeBuildInputs = oa.nativeBuildInputs ++ [final.libtermkey];
         });
       };