Move external control plane doc to install section (#9727)

* Move external control plane doc to install section

* lint

* fix feature-stages broken link

content/en/docs/setup/install/external-controlplane/index.md

@@ -1,7 +1,9 @@
 ---
 title: Install Istio with an External Control Plane
 description: Install an external control plane and remote cluster.
-weight: 80
+weight: 50
+aliases:
+    - /docs/setup/additional-setup/external-controlplane/
 keywords: [external,control,istiod,remote]
 owner: istio/wg-environments-maintainers
 test: yes
@@ -144,7 +146,7 @@ and installing the sidecar injector webhook configuration on the remote cluster
 
 #### Set up the remote config cluster
 
-1. Create the remote Istio install configuration, which installs the injection webhook that uses the
+1. Create the remote cluster's Istio install configuration, which installs the injection webhook that uses the
     external control plane's injector, instead of a locally deployed one. Because this cluster
     also serves as the config cluster, the Istio CRDs and `istio` configmap (i.e., global mesh config)
     are also installed by setting `base.enabled` and `pilot.configMap` to `true`:

content/en/docs/setup/install/external-controlplane/snips.sh

@@ -17,7 +17,7 @@
 
 ####################################################################################################
 # WARNING: THIS IS AN AUTO-GENERATED FILE, DO NOT EDIT. PLEASE MODIFY THE ORIGINAL MARKDOWN FILE:
-#          docs/setup/additional-setup/external-controlplane/index.md
+#          docs/setup/install/external-controlplane/index.md
 ####################################################################################################
 
 snip_set_up_a_gateway_in_the_external_cluster_1() {

content/en/docs/setup/install/helm/index.md

@@ -2,7 +2,7 @@
 title: Install with Helm
 linktitle: Install with Helm
 description: Install and configure Istio for in-depth evaluation.
-weight: 27
+weight: 30
 keywords: [kubernetes,helm]
 owner: istio/wg-environments-maintainers
 icon: helm

content/en/docs/setup/install/operator/index.md

@@ -1,7 +1,7 @@
 ---
 title: Istio Operator Install
 description: Instructions to install Istio in a Kubernetes cluster using the Istio operator.
-weight: 25
+weight: 20
 keywords: [kubernetes, operator]
 aliases:
     - /docs/setup/install/standalone-operator

content/en/docs/setup/install/virtual-machine/index.md

@@ -1,7 +1,7 @@
 ---
 title: Virtual Machine Installation
 description: Deploy Istio and connect a workload running within a virtual machine to it.
-weight: 40
+weight: 60
 keywords:
 - kubernetes
 - virtual-machine

content/en/news/releases/1.8.x/announcing-1.8/change-notes/index.md

@@ -141,7 +141,7 @@ Mixer-focused CRDs and component and related functionality.
 
 ## Installation
 
-- **Promoted** [external control plane](/docs/setup/additional-setup/external-controlplane/) to alpha.
+- **Promoted** [external control plane](/docs/setup/install/external-controlplane/) to alpha.
   ([Issue #11](https://github.com/istio/enhancements/issues/11))
 
 - **Updated** Kiali addon to version 1.26.

data/features.yaml

@@ -234,7 +234,7 @@ features:
       nextExpectedPromotion: ""
     area: Core
   - name: "External Control Plane"
-    link: "/docs/setup/additional-setup/external-controlplane/"
+    link: "/docs/setup/install/external-controlplane/"
     level:
       checklist: features/external_istiod.md
       maturity: Alpha