/docs: Source single-page hmtl for Interactive menu-enabled version of this song collection https://gorodnichy.github.io/noel/ (mirror: https://rpubs.com/ivim/noel)
/docs/book: Source html files for multi-page Bookdown version of this song collection https://gorodnichy.github.io/noel/book (mirror: https://bookdown.org/gorodnichy/Noel/)
/Rmd: Source Rmd files that are used to generage the above two versions.
/Rmd/extra: R code to do text mining and generate word cloud from the lyrics of the songs in both languages