reveal.js template and slides for Our World in Data

Commits to the master branch of this repo are published automatically to https://slides.ourworldindata.org via Netlify

Reminder about how Netlify maps file structure to urls:

/global-health/index.html => https://slides.ourworldindata.org/global-health/

/global-health/global-health.html => https://slides.ourworldindata.org/global-health/global-health