Idea: Re-write the workshop to tell a story

[gvegayon]

Right now, the workshop has somewhat disconnected parts that walk through the different features of netdiffuseR. Instead, we could take a dataset as a baseline and write the workshop around that. I envision something like the following:

1. Intro to diff of innovations theory.
2. Read diffusion data in.
3. Inspect it: visualizations and basic tables.
4. Diffreg model.
5. Simulations.

This would allow building something more interesting for the attendees who would fit great with their code. We can use all the materials in the workshop to add them as vignettes for the package and a baseline for the workshop contents.

attn @aoliveram @twvalente