feat: add 'k8s' home module

home/modules/k8s/default.nix

@@ -0,0 +1,18 @@
+{ pkgs, ... }:
+
+{
+  home.packages = with pkgs; [
+    argocd
+    fluxcd
+    k3d
+    kubectl
+    kubernetes
+    kubernetes-helm
+    kustomize
+    minikube
+    opentofu
+    upbound
+  ];
+
+  imports = [ ./k9s.nix ];
+}