Commits
Ian Cook authored and Neal Richardson committed c7485b7f7f2
ARROW-11477: [R][Doc] Reorganize and improve README and vignette content Closes #10014 from ianmcook/ARROW-11477 Lead-authored-by: Ian Cook <ianmcook@gmail.com> Co-authored-by: Neal Richardson <neal.p.richardson@gmail.com> Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>