Flake updates and simplifying IVR

Failed attempts to enable unfree packages
Commented out github plugin for VSCode
Made standalone Home Manager not fail to find caches and honor more
settings

modules/nix-conf.nix

@@ -1,4 +1,9 @@
-{ pkgs, ... }:
+{
+  pkgs,
+  cache ? true,
+  lib,
+  ...
+}:
 
 {
   nix = {
@@ -17,31 +22,40 @@
       keep-derivations = true;
       min-free = (toString (1024 * 1024 * 1024));
       max-free = (toString (5 * 1024 * 1024 * 1024));
+      cores = 0; # Use all cores for builds
       trusted-users = [
         "greg"
         "gregory.hellings"
       ]; # For home and for work machines
-      substituters = [
-        "http://nas.home:9000/binary-cache/"
-        "https://cache.garnix.io"
-        "https://ai.cachix.org"
-        "https://nixpkgs-python.cachix.org"
-        "https://greg-hellings.cachix.org"
-        "https://nix-community.cachix.org"
-      ];
+      substituters =
+        (lib.optionals cache [
+          "http://nas.thehellings.lan:9000/binary-cache/"
+          "http://nas.home:9000/binary-cache/"
+        ])
+        ++ [
+          "https://cache.garnix.io"
+          "https://ai.cachix.org"
+          "https://nixpkgs-python.cachix.org"
+          "https://greg-hellings.cachix.org"
+          "https://nix-community.cachix.org"
+          "https://cache.nixos.org"
+        ];
       trusted-public-keys = [
+        "nix.thehellings.lan:0qWYHn3gGllXChhAaaxKlNZtRy6yG/XJs1RFSqV3nW8="
         "nix.home:0qWYHn3gGllXChhAaaxKlNZtRy6yG/XJs1RFSqV3nW8="
         "cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g="
         "ai.cachix.org-1:N9dzRK+alWwoKXQlnn0H6aUx0lU/mspIoz8hMvGvbbc="
         "nixpkgs-python.cachix.org-1:hxjI7pFxTyuTHn2NkvWCrAUcNZLNS3ZAvfYNuYifcEU="
         "greg-hellings.cachix.org-1:y01Jl/L5evlhxdnUW6n56AiI1k8g1wxWhTxJCe7XSco="
         "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+        "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
       ];
     };
   };
 
   nixpkgs.config = {
     allowUnfree = true;
+    allowUnfreePredicate = _: true;
     permittedInsecurePackages = [ "jitsi-meet-1.0.8043" ];
   };
 }