Use related path in our docs for imgs, previous
can not use because website need the absolute path
from root directory, and after we merged
apache/dolphinscheduler-website#789 we have covert
function to do that
close: #9426
* [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