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/golo.js

@@ -0,0 +1,22 @@
+module.exports = function(hljs) {
+    return {
+      keywords: {
+        keyword:
+          'println readln print import module function local return let var ' +
+          'while for foreach times in case when match with break continue ' +
+          'augment augmentation each find filter reduce ' +
+          'if then else otherwise try catch finally raise throw orIfNull ' +
+          'DynamicObject|10 DynamicVariable struct Observable map set vector list array',
+        literal:
+          'true false null'
+      },
+      contains: [
+        hljs.HASH_COMMENT_MODE,
+        hljs.QUOTE_STRING_MODE,
+        hljs.C_NUMBER_MODE,
+        {
+          className: 'meta', begin: '@[A-Za-z]+'
+        }
+      ]
+    }
+};