fix!: make all nixosConfigurations build

Specifically `homix`
- remove manual `home-manager` module definition
Import `(r)agenix` and `agenix-rekey` by default for all `NixOS` configurations
Move `machines.nix` flake module import to `configuration.nix` from `flake.nix`

nix/agenix.nix

@@ -7,9 +7,7 @@
 
   perSystem = {
     agenix-rekey = {
-      nodes = {
-        inherit (self.nixosConfigurations) jeeves;
-      };
+      nodes = self.nixosConfigurations;
     };
   };
 }

nix/configurations.nix

@@ -1,7 +1,6 @@
 { lib, config, self, inputs, withSystem, ... }:
 
 let
-  # TODO: works?
   outputs = self;
   inherit (import ./utils.nix { inherit lib self; })
     and
@@ -45,6 +44,9 @@ let
       # Home Manager
       inputs.home-manager.nixosModules.home-manager
       (homeManagerModule args)
+      # (r)agenix && agenix-rekey
+      inputs.ragenix.nixosModules.default
+      inputs.agenix-rekey.nixosModules.default
       # nix-topology
       inputs.nix-topology.nixosModules.default
       # Sane default `networking.hostName`
@@ -134,6 +136,10 @@ let
           machines));
 in
 {
+  imports = [
+    ./machines.nix
+  ];
+
   flake = {
     # Configurations
     nixosConfigurations =

nix/topology/default.nix

@@ -50,10 +50,7 @@
     };
   in {
     topology = {
-      nixosConfigurations = {
-        inherit (self.nixosConfigurations)
-          jeeves;
-      };
+      nixosConfigurations = self.nixosConfigurations;
       modules = [
         ({ config, ... }: let
           inherit (config.lib.topology)