Create a simple standalone script from a remake file.
make_script(target_names = NULL, verbose = FALSE, filename = NULL, remake_file = "remake.yml")
NULL to build the default target (if specified in the
remakefile).NULL (the default) then an a character vector is returned
that can be inspected. It can also be sourced without writing to
file using source_character.remake.yml). This is passed to remake().