Update app config, change default descriptions

config/app.php

@@ -108,8 +108,8 @@ return [
 
     'cipher' => 'AES-256-CBC',
 
-    'short_description' => 'Pixelfed - Photo sharing for everyone',
-    'description' => 'Pixelfed - Photo sharing for everyone',
+    '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,
     'logo' => '/img/pixelfed-icon-color.svg',