Revert "fixes" from StyleCI

These were intended, to simplify getting started or changing things in
the base skeleton.

StyleCI has now been disabled for this repository.

extend.php

@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+use Flarum\Extend;
+
 return [
     // Register extenders here to customize your forum!
 ];

public/index.php

@@ -13,8 +13,8 @@ require '../vendor/autoload.php';
 
 $server = new Flarum\Http\Server(
     Flarum\Foundation\Site::fromPaths([
-        'base'    => __DIR__.'/..',
+        'base' => __DIR__.'/..',
-        'public'  => __DIR__.'/../public',
+        'public' => __DIR__.'/../public',
         'storage' => __DIR__.'/../storage',
     ])
 );