* 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
This patch change the structure and make it more sense
* Remove dev doc in tab Docs, and for now you could only see it in
history-version page
* Move PyDolphinScheduler from tab DOCS to sidebar and combine with open
API
* Move installation after Functions
* Move data quality after HOW-TOS
* [doc] Migrate dev doc from website repository
* Correct release language
* Fix license issue
* Add all images from website
* Delete unused images
* Add CI
* Fix ci
* fix ci
* Remove no need file
* Add latest commit from website
* correct img_utils.py script
* Remove unused imgs