[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

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -22,11 +22,12 @@ labels: [ "bug", "Waiting for reply" ]
 body:
   - type: markdown
     attributes:
-      value: |
+      value: >
         Please make sure what you are reporting is indeed a bug with reproducible steps, if you want to ask questions
         or share ideas, you can head to our
-        [Discussions](https://github.com/apache/dolphinscheduler/discussions) tab, you can also [subscribe to our mailing list](mailto:dev-subscribe@dolphinscheduler.apache.org) and send 
-        emails to [our mailing list](mailto:dev@dolphinscheduler.apache.org)
+        [Discussions](https://github.com/apache/dolphinscheduler/discussions) tab, you can also
+        [join our slack](https://join.slack.com/t/asf-dolphinscheduler/shared_invite/zt-omtdhuio-_JISsxYhiVsltmC5h38yfw)
+        and send your question to channel `#troubleshooting`
 
         For better global communication, Please write in English.
 

README.md

@@ -86,7 +86,7 @@ We would like to express our deep gratitude to all the open-source projects used
 ## Get Help
 
 1. Submit an [issue](https://github.com/apache/dolphinscheduler/issues/new/choose)
-1. Subscribe to this mailing list: https://dolphinscheduler.apache.org/en-us/community/development/subscribe.html, then email dev@dolphinscheduler.apache.org
+2. [Join our slack](https://join.slack.com/t/asf-dolphinscheduler/shared_invite/zt-omtdhuio-_JISsxYhiVsltmC5h38yfw) and send your question to channel `#troubleshooting`
 
 ## Community
 

README_zh_CN.md

@@ -87,8 +87,8 @@ Dolphin Scheduler使用了很多优秀的开源项目，比如google的guava、g
 
 ## 获得帮助
 
-1. 提交issue
-2. 先订阅邮件开发列表:[订阅邮件列表](https://dolphinscheduler.apache.org/zh-cn/community/development/subscribe.html), 订阅成功后发送邮件到dev@dolphinscheduler.apache.org.
+1. 提交 [issue](https://github.com/apache/dolphinscheduler/issues/new/choose)
+2. [加入slack群](https://join.slack.com/t/asf-dolphinscheduler/shared_invite/zt-omtdhuio-_JISsxYhiVsltmC5h38yfw) 并在频道 `#troubleshooting` 中提问
 
 ## 社区
 

docs/docs/en/faq.md

@@ -544,17 +544,6 @@ A: 1, edit nginx config file /etc/nginx/conf.d/escheduler.conf
 
 ---
 
-## Q : Welcome to subscribe the DolphinScheduler development mailing list
-A: In the process of using DolphinScheduler, if you have any questions or ideas, suggestions, you can participate in the DolphinScheduler community building through the Apache mailing list. Sending a subscription email is also very simple, the steps are as follows: 
-
-1, Send an email to dev-subscribe@dolphinscheduler.apache.org with your own email address, subject and content.
-
-2, Receive confirmation email and reply. After completing step 1, you will receive a confirmation email from dev-help@dolphinscheduler.apache.org (if not received, please confirm whether the email is automatically classified as spam, promotion email, subscription email, etc.) . Then reply directly to the email, or click on the link in the email to reply quickly, the subject and content are arbitrary.
-
-3, Receive a welcome email. After completing the above steps, you will receive a welcome email with the subject WELCOME to dev@dolphinscheduler.apache.org, and you have successfully subscribed to the Apache DolphinScheduler mailing list.
-
----
-
 ## Q : Workflow Dependency
 A: 1, It is currently judged according to natural days, at the end of last month: the judgment time is the workflow A start_time/scheduler_time between '2019-05-31 00:00:00' and '2019-05-31 23:59:59'. Last month: It is judged that there is an A instance completed every day from the 1st to the end of the month. Last week: There are completed A instances 7 days last week. The first two days: Judging yesterday and the day before yesterday, there must be a completed A instance for two days.
 

docs/docs/zh/faq.md

@@ -523,18 +523,6 @@ A：1，edit /etc/nginx/conf.d/escheduler.conf
 
 ---
 
-## Q：欢迎订阅 DolphinScheduler 开发邮件列表
-A：在使用 DolphinScheduler 的过程中，如果您有任何问题或者想法、建议，都可以通过 Apache 邮件列表参与到 DolphinScheduler 的社区建设中来。
-   发送订阅邮件也非常简单，步骤如下:
-
-   1，用自己的邮箱向 dev-subscribe@dolphinscheduler.apache.org 发送一封邮件，主题和内容任意。
-
-   2， 接收确认邮件并回复。 完成步骤1后，您将收到一封来自 dev-help@dolphinscheduler.apache.org 的确认邮件（如未收到，请确认邮件是否被自动归入垃圾邮件、推广邮件、订阅邮件等文件夹）。然后直接回复该邮件，或点击邮件里的链接快捷回复即可，主题和内容任意。
-
-   3， 接收欢迎邮件。 完成以上步骤后，您会收到一封主题为 WELCOME to dev@dolphinscheduler.apache.org 的欢迎邮件，至此您已成功订阅 Apache DolphinScheduler的邮件列表。
-
----
-
 ## Q：工作流依赖
 A：1，目前是按照自然天来判断，上月末：判断时间是工作流 A start_time/scheduler_time between '2019-05-31 00:00:00' and '2019-05-31 23:59:59'。上月：是判断上个月从 1 号到月末每天都要有完成的A实例。上周： 上周 7 天都要有完成的 A 实例。前两天： 判断昨天和前天，两天都要有完成的 A 实例。