Added r-htmltools

Added r-base64enc

Added missing LICENSE

r-reprex

It appears I commited the wrong files for r-reprex. Furthermore, upon
correcting these files, I see that I do not yet have a buildable package
of r-reprex. More changes to come.

Added r-conflicted

Added r-memoise

Added r-cachem

Added r-fastmap

Added missing LICENSE

Added r-ragg

Added r-textshaping

Added r-systemfonts

Added r-readxl

Added r-rvest

Added r-reprex

Added r-knitr

Added r-yaml

Added r-highr

Added r-evaluate

Added r-markdown