R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'a5R'

a5R::a5R |  | Getting started with a5R | HTML | source | R code
a5R::arrow-parquet |  | Working with Arrow and Parquet | HTML | source | R code
a5R::internal-cell-representation |  | How a5R stores cell IDs without strings | HTML | source | R code
a5R::multithreading |  | Multi-threading | HTML | source | R code
a5R::traversal-and-distance |  | Traversal and distance | HTML | source | R code