Kubernetes 1.8 reference docs (#5632)

* Kubernetes 1.8 reference docs

* Kubectl reference docs for 1.8

* Update side bar with 1.8 kubectl and api ref docs links

docs/api-reference/v1.8/node_modules/highlight.js/lib/languages/csp.js

@@ -0,0 +1,21 @@
+module.exports = function(hljs) {
+  return {
+    case_insensitive: false,
+    lexemes: '[a-zA-Z][a-zA-Z0-9_-]*',
+    keywords: {
+      keyword: 'base-uri child-src connect-src default-src font-src form-action' +
+        ' frame-ancestors frame-src img-src media-src object-src plugin-types' +
+        ' report-uri sandbox script-src style-src', 
+    },
+    contains: [
+    {
+      className: 'string',
+      begin: "'", end: "'"
+    },
+    {
+      className: 'attribute',
+      begin: '^Content', end: ':', excludeEnd: true,
+    },
+    ]
+  };
+};