R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'dppca'

dppca::algorithms |  | Algorithms | HTML | source | R code
dppca::dp_score |  | DP score plots in dppca | HTML | source | R code
dppca::dp_scree |  | DP scree in dppca | HTML | source | R code
dppca::pc_direction |  | PC Directions in dppca | HTML | source | R code
dppca::pca_background |  | Principal Component Analysis Background | HTML | source | R code