feat: move kubernetes dir into templates to support jinja2 across all files (#831)

template/templates/kubernetes/apps/flux-system/weave-gitops/app/secret.sops.yaml.j2

@@ -0,0 +1,10 @@
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: cluster-user-auth
+  namespace: flux-system
+type: Opaque
+stringData:
+  username: admin
+  password: "{{ bootstrap_weave_gitops_admin_password | password_hash('bcrypt', rounds=10) }}"