stevetemplates
is available on CRAN and will be hosting my R Markdown templates going forward. You can read more about it at this Github repo. You can install it in R.
install.packages("stevetemplates")
I love R Markdown and effectively abandoned LaTeX for it. I have a suite of R Markdown templates for 1) academic manuscripts, 2) Beamer presentations, and 3) academic syllabi. You can find them here.