R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'RAthena'

RAthena::aws_athena_query_caching |  | AWS Athena Query Caching | HTML | source |
RAthena::aws_athena_unload |  | AWS Athena Unload | HTML | source |
RAthena::aws_s3_backend |  | AWS S3 Backend | HTML | source | R code
RAthena::changing_backend_file_parser |  | Changing Backend File Parser | HTML | source |
RAthena::convert_and_save_cost |  | Convert and Save Cost | HTML | source |
RAthena::getting_started |  | Getting Started | HTML | source |
RAthena::how_to_retry |  | How to Retry? | HTML | source |