Update app config, add description and rule env variables

config/app.php

@@ -101,9 +101,9 @@ return [
 
     'cipher' => 'AES-256-CBC',
 
-    'short_description' => 'Pixelfed is an image sharing platform, an ethical alternative to centralized platforms.',
-    'description' => 'Pixelfed is an image sharing platform, an ethical alternative to centralized platforms.',
-    'rules' => null,
+    'short_description' => env('PF_SHORT_DESCRIPTION', 'Pixelfed is an image sharing platform, an ethical alternative to centralized platforms.'),
+    'description' => env('PF_DESCRIPTION', 'Pixelfed is an image sharing platform, an ethical alternative to centralized platforms.'),
+    'rules' => env('PF_RULES', null),
     'logo' => '/img/pixelfed-icon-color.svg',
     'banner_image' => '/storage/headers/default.jpg',
     'dev_log' => env('PIXELFED_DEV_LOG', false),