[Docs] Add docs for Python kernel

[frank-zsy]

We need to add docs for Python kernel and also push Python kernel docker image for developers to use.

[open-digger-bot]

This issue has not been replied for 24 hours, please pay attention to this issue: @gymgym1212 @xiaoya-yaya

[yoyo-wu98]

During writing the doc of Sample Data Usage for Python Kernel #998 , I find the doc a bit difficult to read through.
I think the structure of the open-digger is a bit complex and unfriendly to both node.js and python developers.
Is there any plan to tell the 2 versions(node.js and python) apart? Or some better idea? Or is this the current structure the best choice?

[frank-zsy]

Yes, actually I think a better idea is to separate the python and node.js kernel file into different folders like src/node/ and src/python, so developers can understand better and focused on a certain kernel.

[xgdyp]

Hello @frank-zsy , I think we can store our python_kernel image into our remote DockerHub so we don't have to build image again. What do you think?

[xgdyp]

Would you like to test the new docs on #998？@Zi1l

[frank-zsy]

Hello @frank-zsy , I think we can store our python_kernel image into our remote DockerHub so we don't have to build image again. What do you think?

Yes, of course.

[l1tok]

Would you like to test the new docs on #998？@Zi1l

Based on the new docs with python_kernel, open-digger can run successfully. Besides, I am sorry that I didn't see the message in time because of the chage of my ID.