Including Notebook based testing

[yellowbean]

Background

Some code samples from the document can be easily outdated and trigger error .

To solve this , I would like to include the notebook based testing which will be included in the regression ,then for each new release of absbox, the sample code should work and the output of result should be correct ( or "same" as previous version )

Reference

https://pytest-notebook.readthedocs.io/en/latest/user_guide/tutorial_intro.html

[yellowbean]

Now user can find notebook based sample !

https://absbox-doc.readthedocs.io/en/latest/nbsample/index.html#

[yellowbean]

TODO:

• Implement regression testing for nb examples
• migrate the existing samples to nb examples