[TASK] Add slackbot.typo3.dev and slackbot.typo3.org, remove stage.t3bot.de

https://github.com/NeoBlack/T3Bot/issues/16

assets/hooks/change-merged.d/t3bot.de.phpsh

@@ -16,8 +16,9 @@ $args['message'] = getCommitMessage($args['project'], $args['commit']);
 $args['token'] = getenv('HOOK_TOKEN_t3bot');
 
 $urls = [
-    'https://stage.t3bot.de/hooks/gerrit/?action=' . $args['action'],
     'https://www.t3bot.de/hooks/gerrit/?action=' . $args['action'],
+    'https://slackbot.typo3.dev/hooks/gerrit/?action=' . $args['action'],
+    'https://slackbot.typo3.org/hooks/gerrit/?action=' . $args['action'],
 ];
 
 $options = [

assets/hooks/patchset-created.d/t3bot.de.phpsh

@@ -16,8 +16,9 @@ $args['message'] = getCommitMessage($args['project'], $args['commit']);
 $args['token'] = getenv('HOOK_TOKEN_t3bot');
 
 $urls = [
-    'https://stage.t3bot.de/hooks/gerrit/?action=' . $args['action'],
     'https://www.t3bot.de/hooks/gerrit/?action=' . $args['action'],
+    'https://slackbot.typo3.dev/hooks/gerrit/?action=' . $args['action'],
+    'https://slackbot.typo3.org/hooks/gerrit/?action=' . $args['action'],
 ];
 
 $options = [