Add pointers to the recent ISB training materials

[fedorov]

from Fabian:

Hi Andrey,
I’ve attached the files that David did again, we host the Jupyter notebook (the ipynb and the pdf) in our github:
https://github.com/isb-cgc/Community-Notebooks/blob/master/TeachingMaterials/2021-10-NIHLibrarySession/ISB_Cancer_Gateway_in_the_Cloud_(ISB_CGC)_SQL_Reference_Guide.ipynb

There are also three more colab notebooks in the same directory that we converted into a mybinder for our teaching session yesterday.
https://github.com/isb-cgc/Community-Notebooks/tree/master/TeachingMaterials/2021-10-NIHLibrarySession

Let me know if you need any more information

best,
Fabian

[fedorov]

More recent notebook, which deals with a dataset no longer in IDC, so not clear if it should be added https://github.com/ImagingDataCommons/IDC-Docs/runs/5253666566?check_suite_focus=true