GitLab

__Description__

Update Python setup for require packages.

__Major Revisions__
* downgrade requests version to be compatible with python 3.6, add corresponding pipeline for 3.6
* add extra entry in extras_require for nested packages
* update `pip install` contents accordingly

**Description**
Update links of referencing other docs using relative file paths with extensions.

__Major Revisions__

* Refine document structure for user tutorial.

__Minor Revisions__

* Add AMD part in installation.
* Change default config file to latest link.

 Add config and docs for development experience.

__Major Revision__
- Add settings and extensions config for VSCode.
- Add devcontainer config for Codespaces.
- Update document accordingly.

Add docs on:
* Docker image tag list
* Build image and run container instructions

Update SuperBench documents.