Add a Website

[olivroy]

This PR aims to add a pkgdown website to the package.

NOTE: You have to run usethis::use_pkgdown_github_pages() after merging this PR to make this work.

I cannot do it on my side since I don't have write access..

This would allow to create a website for the package docs seamlessly. SImilar to https://dplyr.tidyverse.org/

https://usethis.r-lib.org/reference/use_pkgdown.html

I don't understand the change to the Rproj file, it was automatic.

[olivroy]

@rolkra, this should add a gh action pkgdown, that should be pushed to the repo as well, to make it work.

usethis::use_github_action("pkgdown")

but usually, the first usethis::use_pkgdown_github_pages() should be enough

edit: if you need help, I am happy to assist!