version 0.1.0

Remove packages not used in the workshop.
Use first_slides() from the helper package to generate the 2 first slides.
Fix a bunch of typos.
Load packages only when needed.
Update README.
Use new template.
Pour la présentation 🇫🇷
- simplifie certaines slides

version 0.0.1

Use Rmarkdown over Prezi as presentation support.