Removes cloud router docs (#9464)

Author: DMallare

.changesets/docs_remove_cloud_router.md

@@ -0,0 +1,5 @@
+### Removes cloud router docs ([PR #9464](https://github.com/apollographql/router/pull/9464))
+
+Now that the cloud router service (serverless and dedicated) is retired, we are removing the documentation.
+
+By [@DMallare](https://github.com/DMallare) in https://github.com/apollographql/router/pull/9464

docs/shared/cloud-router-discontinuation-notice.mdx

@@ -287,40 +287,6 @@ items:
             href: "./self-hosted/managed-hosting/railway"
           - label: "Render"
             href: "./self-hosted/managed-hosting/render"
-      - label: "Apollo Cloud Routing"
-        children:
-          - label: "Overview"
-            href: "./cloud/"
-          - label: "Migrate to Self-Hosted"
-            href: "./cloud/migrate-to-self-hosted"
-          - label: "Configuration"
-            href: "./cloud/configuration"
-          - label: "Secure Subgraphs"
-            href: "./cloud/secure-subgraphs"
-          - label: "Subscriptions"
-            href: "./cloud/subscriptions"
-          - label: "Serverless"
-            href: "./cloud/serverless"
-          - label: "Dedicated"
-            children:
-              - label: "Overview"
-                href: "./cloud/dedicated"
-              - label: "Quickstart"
-                href: "./cloud/dedicated-quickstart"
-              - label: "Custom Domains"
-                href: "./cloud/custom-domains"
-              - label: "Throughput Guide"
-                href: "./cloud/throughput-guide"
-              - label: "Migrate to Dedicated"
-                href: "./cloud/migrate-to-dedicated"
-              - label: "AWS Lattice"
-                children:
-                  - label: "Lattice Configuration"
-                    href: "./cloud/lattice-configuration"
-                  - label: "Lattice Management"
-                    href: "./cloud/lattice-management"
-                  - label: "Lattice Troubleshooting"
-                    href: "./cloud/lattice-troubleshooting"
       - label: "Tools"
         children:
           - label: "Router Resource Estimator"