- move gitbook files into their own folder at docs/gitbook

- rebuild homepage at `docs/homepage`

docs/gitbook/Advanced/Vuex.md

@@ -0,0 +1,18 @@
+### Change Event <small>Vuex Compatibility</small>
+
+`vue-select` provides a `change` event. This function is passed the currently selected value(s) as it's only parameter.
+
+This is very useful when integrating with Vuex, as it will allow your to trigger an action to update your vuex state object. Choose a callback and see it in action.
+
+
+```html
+<v-select v-on:change="consoleCallback" :options="countries"></v-select>
+```
+
+```js
+methods: {
+  consoleCallback(val) {
+    console.dir(JSON.stringify(val))
+  },
+}
+```