devtools: Move rust feature to devtools

modules/programs/development-tools/development-tools.nix

@@ -1,9 +1,5 @@
 { inputs, ... }: {
   flake.modules.nixos.development-tools = { pkgs, ... }: {
-    imports = with inputs.self.modules.nixos; [
-      rust
-    ];
-
     environment.systemPackages = with pkgs; [
       cmake
       gnumake

modules/programs/development-tools/rust.nix

@@ -6,7 +6,7 @@
     };
   };
 
-  flake.modules.nixos.rust = { pkgs, ... }: {
+  flake.modules.nixos.development-tools = { pkgs, ... }: {
     nixpkgs.overlays = [
       inputs.rust-overlay.overlays.default
     ];