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/broadcasting.php

@@ -32,21 +32,24 @@ return [
 
         'pusher' => [
             'driver' => 'pusher',
-            'key' => env('PUSHER_APP_KEY', 'app-key'),
-            'secret' => env('PUSHER_APP_SECRET', 'app-secret'),
-            'app_id' => env('PUSHER_APP_ID', 'app-id'),
+            'key' => env('PUSHER_APP_KEY'),
+            'secret' => env('PUSHER_APP_SECRET'),
+            'app_id' => env('PUSHER_APP_ID'),
             'options' => [
-                'host' => 'ws.portal.einundzwanzig.space',
-                'port' => 6004,
-                'scheme' => 'https',
+                'host' => env('PUSHER_HOST') ?: 'api-'.env('PUSHER_APP_CLUSTER', 'mt1').'.pusher.com',
+                'port' => env('PUSHER_PORT', 443),
+                'scheme' => env('PUSHER_SCHEME', 'https'),
                 'encrypted' => true,
-                'useTLS' => true,
+                'useTLS' => env('PUSHER_SCHEME', 'https') === 'https',
                 'debug' => true,
                 'curl_options' => [
                     CURLOPT_SSL_VERIFYHOST => 0,
                     CURLOPT_SSL_VERIFYPEER => 0,
                 ],
             ],
+            'client_options' => [
+                // Guzzle client options: https://docs.guzzlephp.org/en/stable/request-options.html
+            ],
         ],
 
         'ably' => [