modified for 1.13 release (#11493)

1.13 + 4 latest releases supported by sig-docs.

_config.yml

@@ -24,11 +24,21 @@ defaults:
       githubbranch: "master"
       docsbranch: "master"
       versions:
+        - fullversion: "v1.13.0"
+          version: "v1.13"
+          githubbranch: "v1.13.0"
+          docsbranch: "release-1.13"
+          url: https://kubernetes.io/docs/
+        - fullversion: "v1.12.0"
+          version: "v1.12"
+          githubbranch: "v1.12.0"
+          docsbranch: "release-1.12"
+          url: https://v1-12.docs.kubernetes.io
         - fullversion: "v1.11.0"
           version: "v1.11"
           githubbranch: "v1.11.0"
           docsbranch: "release-1.11"
-          url: https://kubernetes.io/docs/
+          url: https://v1-11.docs.kubernetes.io
         - fullversion: "v1.10.0"
           version: "v1.10"
           githubbranch: "v1.10.0"
@@ -39,16 +49,6 @@ defaults:
           githubbranch: "v1.9.0"
           docsbranch: "release-1.9"
           url: https://v1-9.docs.kubernetes.io
-        - fullversion: "v1.8.4"
-          version: "v1.8"
-          githubbranch: "v1.8.4"
-          docsbranch: "release-1.8"
-          url: https://v1-8.docs.kubernetes.io
-        - fullversion: "v1.7.6"
-          version: "v1.7"
-          githubbranch: "v1.7.6"
-          docsbranch: "release-1.7"
-          url: https://v1-7.docs.kubernetes.io
       deprecated: true
       currentUrl: https://kubernetes.io/docs/home/
       nextUrl: http://kubernetes-io-vnext-staging.netlify.com/