This is a bunch of changes that I had staged, + a few
typo fixes after going through the deck to check its readiness.
There are no deep changes; just a few extra slides
(e.g. about Kata containers and gVisor, and about
services meshes) and typo fixes.
This was discussed and agreed in #246. It will probably break a few
outstanding PRs as well as a few external links but it's for the
better good long term.