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] Separate and correct getting start by docker

* Correct content of starting docker
* Remove all FAQ in docker.md and only keep
  build image by users themself in faq.md
* Separate how to use incompatible incompatible
  datasource from docker.md to directory datasource

* correct disable flag

* fix download link

* fix wrong anchor

* remove not support anchor for zh docs

* [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