Make 'Websub Hub' configurable

configs.dist.php

@@ -48,6 +48,9 @@ return (object) array(
 	'defaultLong' => '0.1278',
 	'defaultLoc' => 'London',
 
+	// Config for Websub hub
+	'websubHub' => 'https://switchboard.p3k.io/',
+
 	// Set Frontmatter Format -- json or yaml
 	'frontFormat' => 'json'
 );

nanopub.php

@@ -722,7 +722,7 @@ if (!empty($data)) {
             //}
             // ping! second one to switchboard
             $switchArray = array ("hub.mode" => "publish", "hub.url" => $siteUrl);
-            post_to_api("https://switchboard.p3k.io/", "null", $switchArray);
+            post_to_api($configs->websubHub, "null", $switchArray);
 
             // ... and Setting headers, return location to client.
             header("HTTP/1.1 201 Created");