Default config files

In an effort to make upgrading the constantly changing config files
easier, Shift defaulted them and merged your true customizations -
where ENV variables may not be used.

config/services.php

@@ -2,6 +2,10 @@
 
 return [
 
+    'horizon' => [
+        'secret' => env('HORIZON_SECRET'),
+    ],
+
     /*
     |--------------------------------------------------------------------------
     | Third Party Services
@@ -14,10 +18,6 @@ return [
     |
     */
 
-    'horizon' => [
-        'secret' => env('HORIZON_SECRET'),
-    ],
-
     'mailgun' => [
         'domain' => env('MAILGUN_DOMAIN'),
         'secret' => env('MAILGUN_SECRET'),