overhaul selecting docs, updated navigation and URL structure

docs/guide/vuex.md

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+### Using the `input` Event with Vuex
+
+`vue-select` emits the `input` event any time the internal `value` is changed. 
+This is the same event that allow the for the `v-model` syntax. When using
+Vuex for state management, you can use the `input` event to dispatch an
+action, or trigger a mutation.
+
+```html
+<v-select 
+    @input="myAction" 
+    :options="$store.state.options"
+    :value="$store.state.selected"
+  ></v-select>
+``` 
+
+<CodePen url="aJQJyp" height="350"/>