The navigation dropdown doesn't work (#37)

* The navigation dropdown didn't work on mobile phons (or small desktop viewports)

* The navigation dropdown didn't work on mobile phons (or small desktop viewports)

Author: EddyVerbruggen

layouts/docs.ejs

@@ -11,7 +11,7 @@
     <%- include('_partials/header') %>
     <div class="bg-grey-lighter md:hidden">
         <div class="container mx-auto p-4">
-            <select v-nav class="w-full p-2" title="Navigation">
+            <select onchange="window.location = this.options[this.selectedIndex].value" class="w-full p-2" title="Navigation">
                 <%- include('_partials/categories_select', { entry: { children: meta.docs_categories } }) %>
             </select>
         </div>