Switch to zero-config setup, remove config and bootstrap dirs (#2839)

* Remove config directory

* feat(zeroconfig): Add support for zero-config

* test(php-lint): remove config directory

* chore(readme): update dir structure

* admin/customizer has been removed

Co-authored-by: QWp6t <hi@qwp6t.me>

composer.json

@@ -59,10 +59,17 @@
   "prefer-stable": true,
   "scripts": {
     "lint": [
-      "phpcs --extensions=php --standard=PSR12 app config"
+      "phpcs --extensions=php --standard=PSR12 app"
     ],
     "post-autoload-dump": [
       "Roots\\Acorn\\ComposerScripts::postAutoloadDump"
     ]
+  },
+  "extra": {
+    "acorn": {
+      "providers": [
+        "App\\Providers\\ThemeServiceProvider"
+      ]
+    }
   }
 }