Transcribe most of the keynote into Deckset

The initial part of it, anyways. The recommendations for avoiding state
will be significantly different now that Swift.
Outline some good sections for minimizing state
Moar slides
Revamp Purity outline a bit
Start adding Isolation slides
Finish up Isolation slides, add conclusion
Refactor intro slides to have more impact
Refactoring more slides
Refactor Values section
Update “Pure functions”
Refactor Isolation section and end slides
Reiterate the takeaway
Note Deckset and the theme used
Render
Display @andymatuschak shoutout properly
Better A. Einstein formatting
Annotate where more notes are needed, reformat
Flesh out explanation about mutating structs
Render
_can_ “go bad”