* feat: Modifying Slack Links

* append
Co-authored-by: NJiajie Zhong <zhongjiajie955@gmail.com>

* Our community do not have official support for stack overflow any more
* Change the order side for Slack and mailing list, to avoid some users
  just want to ask question but join mailing list, and then unsubscribe
  found there are too many emails in mailing list

* [doc] Migrate develop docs from website

developer should also into main repo, because
development setup should follow with the latest
code

* Add missing change from website