overhaul selecting docs, updated navigation and URL structure

docs/guide/templating.md

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+#### Scoped Slot `option`
+
+vue-select provides the scoped `option` slot in order to create custom dropdown templates.
+
+```html
+<v-select :options="options" label="title">
+    <template slot="option" slot-scope="option">
+        <span :class="option.icon"></span>
+        {{ option.title }}
+    </template>
+  </v-select>
+``` 
+
+Using the `option` slot with `slot-scope="option"` gives the 
+provides the current option variable to the template.
+
+<CodePen url="NXBwYG" height="500"/>