SP-2381: update firefly NB

[shenmingfu]

Added methods: zooming and displaying frames side by side.

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[MelissaGraham]

Thanks Shenming, my review is available as #81. The new sections didn't fit very well with what was already there, so I rearranged it to work with the established flow of the notebook. This required some changes to the screenshot but otherwise it's pretty much the same content.

For the FireflyClient I added how this is basically an instance of the Portal and linked to the Portal resources.

Once you merge my PR 81 into your branch, make any final tweaks in your branch (and do a final flake8 check), so long as the checks on your PR 79 are passing you're OK to merge. If there are any new issues just let me know.

[shenmingfu]

Thank you so much Melissa! I've merged your PR 81 into my branch.

[shenmingfu]

Final tweaks and the final flake8 check were done. Ready to merge.