Update ignore settings as per projr config
projr_dir_ignore.RdEnsure projr directories are ignored
appropriately (in .gitignore and .Rbuildignore)
as per _projr.yml.
git_skip_adjust logical.
If TRUE, then the directories
are skipped by Git if already tracked
and they are supposed to be ignored
as per _projr.yml.
Default is NULL, in which
case the settings as per _projr.yml
are used (or the default, if unspecified there).