Vuex (#8041)

* add vuex, cleanup client directory and create example components

* disale sample unit test

* disable import for non existing file

* correct regexp for unit tests, add simple test to avoid error, add babel-polyfill for Vuex

* add line wrongly removed, update regexp

website/client/components/home.vue

@@ -0,0 +1,13 @@
+<template lang="pug">
+p {{ msg }}
+</template>
+
+<script>
+export default {
+  data () {
+    return {
+      msg: 'You\'re on the Home page!',
+    };
+  },
+};
+</script>