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/mizar.js

@@ -0,0 +1,18 @@
+module.exports = function(hljs) {
+  return {
+    keywords:
+      'environ vocabularies notations constructors definitions ' +
+      'registrations theorems schemes requirements begin end definition ' +
+      'registration cluster existence pred func defpred deffunc theorem ' +
+      'proof let take assume then thus hence ex for st holds consider ' +
+      'reconsider such that and in provided of as from be being by means ' +
+      'equals implies iff redefine define now not or attr is mode ' +
+      'suppose per cases set thesis contradiction scheme reserve struct ' +
+      'correctness compatibility coherence symmetry assymetry ' +
+      'reflexivity irreflexivity connectedness uniqueness commutativity ' +
+      'idempotence involutiveness projectivity',
+    contains: [
+      hljs.COMMENT('::', '$')
+    ]
+  };
+};