Internal helper that renders inst/templates/_toolero.yml with a folder
list and a conventions block and writes the result to dest. Used by both
init_project(), which writes the resolved structure of a project it has
just created, and generate_project_config(), which writes the defaults
as a starting point for hand editing. One writer, one format.
Usage
.write_project_yml(
dest,
folders = .default_folders(),
conventions = .default_conventions()
)