Conceptually understand how `conmat` works under the hood

[chitrams]

A few things I wanted to understand

• Understand the math underlying conmat computation - read through Nick Golding's gist
• Think about Figure 1 (methods and data) in Prem et al. (2017)'s paper more carefully
• Another read of Prem et al. (2017)'s paper wouldn't hurt
• And read up on how they compared their 2020 matrices to those from 2017 in their 2021 paper

Much more advanced, for later (if at all)

• Understand SIR modelling with conmat - vignette
• Understand how to generate an NGM and apply vaccination rates - vignette
  • What is a Next Generation Matrix?