feat: fw remove unstable packages

hosts/fw/modules/home-assistant/electricity.nix

@@ -1,11 +1,7 @@
-{ config, ... }: 
+{ config, pkgs, ... }: 
 let
-  unstable = import
-      (builtins.fetchTarball https://github.com/nixos/nixpkgs/tarball/nixpkgs-unstable)
-      # reuse the current configuration
-      { config = config.nixpkgs.config; };
 in {
-  services.home-assistant.customComponents = with unstable.home-assistant-custom-components; [
+  services.home-assistant.customComponents = with pkgs.home-assistant-custom-components; [
     epex_spot
   ];
 

hosts/fw/modules/vscode-server.nix

@@ -2,10 +2,6 @@
 
 let
   hostname = "vscode-server";
-  unstable = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/nixos-unstable.tar.gz") {
-    config = config.nixpkgs.config;
-    system = pkgs.system;
-  };
 in {
   microvm.vms.${hostname} = {
     autostart = true;
@@ -24,7 +20,7 @@ in {
       };
 
       environment.systemPackages = [
-        unstable.ddev
+        pkgs.ddev
       ];
 
       # Docker is required for ddev