Updated all the notebooks and the README file

[Ragadeepika-Pucha]

@rnikutta @stephjuneau @jacquesalice - I updated the DESI-related notebooks and the associated ReadMe File:

• I modified the cell containing the redshift distribution plot to include a for-loop over the targeting classes. I did not want to include a plotting function - because I personally do not like to include functions in the middle of the cell without proper doc-string. I can change it if the current version is not good?
• I updated my affiliation and contact information.
• I added the authentication cell to the DESI-EDR with DESI kernel and DESI/SDSS comparison notebooks, to be consistent with the DESI-EDR Py3 notebook.
• I added a bullet regarding the Py3 notebook in the ReadMe file.

Let me know if anything else needs to be updated/changed. Thank you!

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