chore(nixos): re-organise packages

Remove packages that are either no longer used or have been moved into
per-project flakes that are used with direnv.

system/nixos/home-manager-desktop.nix

@@ -1,11 +1,6 @@
 { config, inputs, pkgs }:
 
 {
-  nixpkgs = {
-    config.allowUnfreePredicate = pkg:
-      builtins.elem (inputs.lib.getName pkg) [ "postman" ];
-  };
-
   services.swayidle = {
     enable = true;
 

system/nixos/home-manager.nix

@@ -15,7 +15,6 @@ in
     pkgs.pamixer
     pkgs.pass
     pkgs.pinentry
-    pkgs.postman
     pkgs.slack
     pkgs.via
     pkgs.vial

system/shared/home-manager-packages.nix

@@ -23,24 +23,11 @@ with pkgs; [
   lua
   mysql
   neofetch
-  nodePackages."http-server"
-  nodePackages.eslint
-  nodePackages.prettier
-  nodejs
-  php81
-  php81Packages.composer
-  php81Packages.phpcbf
-  php81Packages.phpcs
-  php81Packages.phpstan
-  platformsh
-  pulumi-bin
   pv
-  python3Full
   ripgrep
   rustywind
   terraform
   tldr
-  tmuxinator
   tree
   tree-sitter
   unzip