Revert "website: latest migration to new structure" (#11634)

Revert "website: latest migration to new structure (#11522)"

This reverts commit 9a89a5f94b.

website/docs/add-secure-apps/providers/proxy/_envoy_istio.md

@@ -1,51 +0,0 @@
-Set the following settings on the _IstioOperator_ resource:
-
-```yaml
-apiVersion: install.istio.io/v1alpha1
-kind: IstioOperator
-metadata:
-    name: istio
-    namespace: istio-system
-spec:
-    meshConfig:
-        extensionProviders:
-            - name: "authentik"
-              envoyExtAuthzHttp:
-                  # Replace with <service-name>.<namespace>.svc.cluster.local
-                  service: "ak-outpost-authentik-embedded-outpost.authentik.svc.cluster.local"
-                  port: "9000"
-                  pathPrefix: "/outpost.goauthentik.io/auth/envoy"
-                  headersToDownstreamOnAllow:
-                      - cookie
-                  headersToUpstreamOnAllow:
-                      - set-cookie
-                      - x-authentik-*
-                      # Add authorization headers to the allow list if you need proxy providers which
-                      # send a custom HTTP-Basic Authentication header based on values from authentik
-                      # - authorization
-                  includeRequestHeadersInCheck:
-                      - cookie
-```
-
-Afterwards, you can create _AuthorizationPolicy_ resources to protect your applications like this:
-
-```yaml
-apiVersion: security.istio.io/v1beta1
-kind: AuthorizationPolicy
-metadata:
-    name: authentik-policy
-    namespace: istio-system
-spec:
-    selector:
-        matchLabels:
-            istio: ingressgateway
-    action: CUSTOM
-    provider:
-        name: "authentik"
-    rules:
-        - to:
-              - operation:
-                    hosts:
-                        # You can create a single resource and list all Domain names here, or create multiple resources
-                        - "app.company"
-```