GitLab

* Reduce requirements if waymo dataset is not used

* Update waymo.md

* Update optional.txt

* Update waymo.md

Add instructions of requirements/optional.txt related to waymo

* Update docs and add hints for waymo

* Change the title of waymo tutorial

* Move waymo into the tutorial part

* Delete original waymo.md

* Update waymo.md

* Update index.rst

* Update get_started in readme.md

* reorganize docs
Co-authored-by: zhangwenwei <wayne.zw@outlook.com>

Deleted docs/tutorials/data_pipeline.md