website/docs: Change Kubernetes ingress apiVersion out of beta (#4099)

* Change Kubernetes ingress apiVersion out of beta

* fix lint

Co-authored-by: Jens Langhammer <jens.langhammer@beryju.org>

website/docs/providers/proxy/_nginx_ingress.md

@@ -1,7 +1,7 @@
 Create a new ingress for the outpost
 
 ```yaml
-apiVersion: networking.k8s.io/v1beta1
+apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
     name: authentik-outpost
@@ -9,13 +9,15 @@ spec:
     rules:
         - host: app.company
           http:
-              paths:
-                  - backend:
+              paths: /outpost.goauthentik.io
+              pathType: Prefix
+              backend:
                   # Or, to use an external Outpost, create an ExternalName service and reference that here.
                   # See https://kubernetes.io/docs/concepts/services-networking/service/#externalname
-                        serviceName: ak-outpost-example-outpost
-                        servicePort: 9000
-                    path: /outpost.goauthentik.io
+                  service:
+                      name: ak-outpost-example-outpost
+                      port:
+                          number: 9000
 ```
 
 This ingress handles authentication requests, and the sign-in flow.