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/ebnf.js

@@ -0,0 +1,32 @@
+module.exports = function(hljs) {
+    var commentMode = hljs.COMMENT(/\(\*/, /\*\)/);
+
+    var nonTerminalMode = {
+        className: "attribute",
+        begin: /^[ ]*[a-zA-Z][a-zA-Z-]*([\s-]+[a-zA-Z][a-zA-Z]*)*/
+    };
+
+    var specialSequenceMode = {
+        className: "meta",
+        begin: /\?.*\?/
+    };
+
+    var ruleBodyMode = {
+        begin: /=/, end: /;/,
+        contains: [
+            commentMode,
+            specialSequenceMode,
+            // terminals
+            hljs.APOS_STRING_MODE, hljs.QUOTE_STRING_MODE
+        ]
+    };
+
+    return {
+        illegal: /\S/,
+        contains: [
+            commentMode,
+            nonTerminalMode,
+            ruleBodyMode
+        ]
+    };
+};