[New feature]Create a new package to upload to github docs/

[StevenJokess]

Cost me 5 days to figure out it.
Share with anyone who need.

pip install git+https://github.com/aieye-top/d2l-book2

The part changed:

You can check here to get the result: https://aieye-top.github.io/d2cl/

If you can give a option to choose /root or /docs/ , it will be great.

[StevenJokess]

windows can use my docker:https://github.com/aieye-top/d2l-book2/