reorganize and cleanup php server code

server/database/seeders/RolesSeeder.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Database\Seeders;
+
+use Vanguard\Role;
+use Illuminate\Database\Seeder;
+
+class RolesSeeder extends Seeder
+{
+    /**
+     * Run the database seeds.
+     *
+     * @return void
+     */
+    public function run()
+    {
+        Role::create([
+            'name' => 'Admin',
+            'display_name' => 'Admin',
+            'description' => 'System administrator.',
+            'removable' => false
+        ]);
+
+        Role::create([
+            'name' => 'User',
+            'display_name' => 'User',
+            'description' => 'Default system user.',
+            'removable' => false
+        ]);
+    }
+}