#2619: [doc] Change get help from dev mail list to slack (#9377)

* Change all get help from dev mailing list to slack, because
  we find out mailing list have many users ask for subscribe
  and they maybe subscribe by accident.
* remove join dev mailing list in faq.md because we already
  have it in https://dolphinscheduler.apache.org/en-us/community/development/subscribe.html

commit.ref

@@ -1 +1 @@
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+Subproject commit c828809b461266b24a10356dfcffbbd0590b2f5b

commit.yml

@@ -2,25 +2,46 @@
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