FEATURE: move categories into own repository

Http/Controllers/CategoriesOverview.php

@@ -0,0 +1,22 @@
+<?php namespace Modules\Categories\Http\Controllers;
+
+use App\CMS\Enumerations\ModuleNamesWithIds;
+use App\Http\Controllers\Admin\Controller;
+use Modules\Categories\Entities\Category;
+
+class CategoriesOverview extends Controller
+{
+    public function getOverview()
+    {
+        // get list of all categories
+        $categories = Category::getTree()
+                              ->toArray();
+
+        $modules = ModuleNamesWithIds::getWithTranslations();
+
+        return view('categories::admin.overview', [
+            'categories' => $categories,
+            'modules'    => $modules
+        ]);
+    }
+}