the talk, extracted out into a .md file.

also, README.md is now specific to this presentation.

see https://github.com/hakimel/reveal.js/ for true README.md.
revert a breaking change introduced in burnpanck/reveal.js

https://github.com/burnpanck/reveal.js/commit/652fbe5f2ad4b8425f445355fcfb4e6b228e8213: this breaks a number of tests and breaks note-viewing/remote behavior for fragments.