Add walthrough video of migration notebook to docs?

[dwinston]

@eecavanna recorded a video walkthrough of the latest migration notebook (committed via #761) and shared it on Slack. Is this an asset we could use to enhance the public runtime docs?

Screenshots

[eecavanna]

I'd rather this particular video not be made public. My target audience was our teammates and that affected my choice of words and what I showed on my screen.

I'm working on documentation about the migration process as a whole. (I'm posting this comment on mobile and don't have the ticket number handy.)