Example site
example_site.RdA small, synthetic example site file used for demonstration. It mirrors the nested structure of a real malariaverse site file: grouping keys live in `$sites` (`country`, `iso3c`, `name_1`, `urban_rural`), and `$interventions` is a nested list of per-intervention objects, each with an `$implementation` (and, for ITNs, a `$use`) data.frame. Also includes `$vectors` (pyrethroid resistance) and `$population` (population at risk).