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
there are 162 markdown files in dir `docs`
and all file in project is 175 files, so I
think check all file will not add too much
load for our ci, but it could discovered
the dead link in time to avoid some thing
like #9998
* [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