treewide: Refactor in order to clean up flake.nix

configuration/default.nix

@@ -1,9 +1,13 @@
 {
   pkgs,
   lib,
+  modulesPath,
   ...
 }: {
   imports = [
+    "${modulesPath}/profiles/headless.nix"
+    (import ../modules)
+
     ./services/gitea.nix
     ./services/nextcloud.nix
     ./services/webserver.nix
@@ -12,6 +16,14 @@
     ./sops.nix
   ];
 
+  nixpkgs.overlays = [
+    (final: prev: {
+      local = import ../pkgs {
+        pkgs = prev;
+      };
+    })
+  ];
+
   nix = {
     package = pkgs.nixFlakes;
     extraOptions = ''