Adds section headings and abstracts for the documentation areas.

_data/v1_1/guides.yml

@@ -1,3 +1,5 @@
+bigheader: "User Guides"
+abstract: "How to get started, and acheive tasks, using Kubernetes"
 toc:
 - title: Overview
   path: /v1.1/guides/

_data/v1_1/reference.yml

@@ -1,3 +1,5 @@
+bigheader: "Reference Documentation"
+abstract: "Design docs, concept definitions, and references for APIs and CLIs."
 toc:
 - title: Kubernetes API
   path: /v1.1/reference

_data/v1_1/samples.yml

@@ -1,3 +1,5 @@
+bigheader: "Samples"
+abstract: "A collection of example applications that show how to use Kubernetes."
 toc:
 - title: Clustered Application Samples
   path: /v1.1/samples

_data/v1_1/support.yml

@@ -1,3 +1,5 @@
+bigheader: "Support"
+abstract: "Troubleshooting resources, frequently asked questions, and community support channels."
 toc:
 - title: Troubleshooting
   path: /v1.1/support