overhaul selecting docs, updated navigation and URL structure

docs/guide/values.md

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+## Getting / Setting
+
+### `v-model`
+
+The most common use case for vue-select is to have the chosen value synced with a parent component. vue-select 
+takes advantage of the `v-model` syntax to sync values with a parent. The `v-model` syntax works with
+primitives and objects. 
+
+```html
+<v-select v-model="selected" />
+```
+
+Note that when using the `multiple` prop, the `v-model` value will always be an array.
+
+### Props and Events
+
+Sometimes `v-model` might not fit your use case. For example, when working with [Vuex](https://vuex.vuejs.org),
+you'll need to trigger a mutation rather than mutating a value directly. In that case, maybe you need
+to bind a pre-selected value, and trigger a mutation when it changes. 
+
+vue-select exposes the `value` prop and an `input` event to enable this. This combo of props and 
+events is also how Vue wires up the `v-model` syntax internally.
+
+#### Prop: `value`
+
+The `value` prop lets vue-select know what value is currently selected. It will accept strings, 
+numbers or objects. If you're using a `multiple` v-select, you'll want to pass an array. 
+
+```html
+<v-select :value="selected" />
+```
+
+::: tip 🤓
+Anytime you bind the `value` prop directly, you're responsible for updating the bound variable
+in your code using the `@input` event.
+:::
+
+#### Event: `input`
+
+The `input` event is triggered anytime the value state changes, and is emitted with the `value`
+state as it's only parameter.
+
+#### Vuex Support
+
+The `value` prop and `emit` event are very useful when using a state management tool, like Vuex. 
+You can bind the selected value with `:value="$store.myValue"`, and use the `input` event to
+trigger a mutation, or dispatch an action – or anything else you might need to do when the selection
+changes.
+
+```html
+<v-select :value="$store.myValue" @input="setSelected" />
+```
+
+```js
+methods: {
+  setSelected(value) {
+     //  trigger a mutation, or dispatch an action  
+  }
+}
+```
+## Transforming Selections
+
+When the `options` array contains objects, vue-select returns the whole object as dropdown value upon selection.
+
+If you need to return a single key, or transform the data before it is synced, vue-select provides a `reduce` callback
+ that allows you to transform a selected option before it is passed to the `@input` event. Consider this data structure:
+ 
+ ```js
+ let options = [{code: 'CA', country: 'Canada'}, ...];
+ ```
+ 
+ If we want to display the `country`, but return the `code` to `v-model`, we can use the `reduce` prop to receive
+ only the data that's required.
+ 
+ ```html
+ <v-select :options="options" :reduce="country => country.code" label="country" />
+ ```
+ 
+The `reduce` property also works well when you have a deeply nested value:
+ 
+ ```
+ {
+   country: 'canada',
+   meta: {
+     id: '1',
+     code: 'ca'
+   }
+ }
+ ```
+ 
+ ```html
+ <v-select :options="options" :reduce="country => country.value.id" label="country" />
+ ```
+ 
+ <reducer-nested-value />
+
+## Single/Multiple Selection
+
+By default, vue-select supports choosing a single value. If you need multiple values, use the `multiple` boolean prop,
+much the same way you would on a native `<select>` element. When `multiple` is true, `v-model` or `value` should be
+arrays.
+ 
+
+```html
+<v-select multiple v-model="selected" :options="['foo','bar']" />
+```
+<v-select multiple :options="['foo','bar']" />