Enable GitHub Pages? #153

Some of the presentations in this repo have already been exported to HTML so they could be browsed directly in the browser.

However the GitHub UI won't render these HTML files by default:

But having a simple GitHub Pages deployment would help.

Instead of the traditional gh-pages we can use the dedicated GitHub Action for that to avoid increasing the size of the repo: https://github.com/actions/deploy-pages