fix: add k8s and hpc modules to main repo

modules/default.nix

@@ -0,0 +1,24 @@
+{ lib, ...}:
+with lib;
+{
+  options.features.host = {
+    name = mkOption {
+      type = types.str;
+      default = null;
+    };
+
+    address = mkOption {
+      type = types.str;
+      default = null;
+    };
+
+  };
+
+  imports = [
+    ./k8s
+    ./hpc
+    ./fs
+    ./pki/certs.nix
+    ../nixos
+  ];
+}