* checkout qq group qrcode
* update the cover image
* update build doc
* reorganize chapters
* update readme
* remove index of build on different platforms in readthedocs
* update benchmark
* update get started document in Chinese based on the prebuild package
* update get_started
* re-style benchmark
* update get_started in zh_cn
* update get_started in english
* update get_started in english
* update get_started in english
* update get_started doc
* update according to reviewer comments
* update linker ci
* fix(.github/scripts/check_doc_linker.py): skip code block
* specify PYTHONPATH
* update get_started
* update diagram
* rename some documents
* fix according to reviewer comments
Co-authored-by: tpoisonooo <khj.application@aliyun.com>