Update Federation API ref docs for 1.9. (#6636)

* Update federation API ref docs.

* Move and redirect.

* Move generated Federation docs to the generated directory.

* Fix titles.

* Type

* Fix titles

docs/reference/generated/federation/index.md

@@ -0,0 +1,15 @@
+---
+title: Federation API Reference
+---
+# API Reference
+
+Federation API server supports the following group versions:
+
+* federation/v1beta1: [operations](/docs/federation/api-reference/federation/v1beta1/operations.html), [model definitions](/docs/federation/api-reference/federation/v1beta1/definitions.html)
+* v1: [operations](/docs/federation/api-reference/v1/operations.html), [model definitions](/docs/federation/api-reference/v1/definitions.html)
+* extensions/v1beta1: [operations](/docs/federation/api-reference/extensions/v1beta1/operations.html), [model definitions](/docs/federation/api-reference/extensions/v1beta1/definitions.html)
+
+
+<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
+[![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/docs/federation/api-reference/README.md?pixel)]()
+<!-- END MUNGE: GENERATED_ANALYTICS -->