refactor: Remove local package overlay

configuration/default.nix

@@ -30,8 +30,6 @@
     ./nginx
   ];
 
-  nixpkgs.overlays = [ (_: prev: { local = import ../pkgs { pkgs = prev; }; }) ];
-
   nix = {
     extraOptions = ''
       experimental-features = nix-command flakes

configuration/services/starbound.nix

@@ -1,4 +1,9 @@
-{ pkgs, lib, ... }:
+{
+  flake-inputs,
+  pkgs,
+  lib,
+  ...
+}:
 let
   inherit (lib) concatStringsSep;
 in
@@ -11,7 +16,9 @@ in
     after = [ "network.target" ];
 
     serviceConfig = {
-      ExecStart = "${pkgs.local.starbound}/bin/launch-starbound ${./configs/starbound.json}";
+      ExecStart = "${
+        flake-inputs.self.packages.${pkgs.system}.starbound
+      }/bin/launch-starbound ${./configs/starbound.json}";
 
       Type = "simple";