Separate deprecated functions from others

[olivroy]

Just so it doesn't show.

Note that I was not able to load the package with load_all() (Windows R 4.3.2), so you will need to document()

To get the website up to date, you may want to use usethis::use_pkgdown_github_pages(), so it is updated on push!

I used usethis::use_pkgdown() as well urlchecker::url_check() to check links.

[edzer]

Thanks!