Consider moving manual example in a pkgdown website for visual inspection

[cderv]

Currently, I am adding Rmd for manual test in tests/manual

I wonder if it could be maybe better to add those tests so that they are viewable through a pkgdown website.

• Either hidden in the pkgdown website like pkgdown own visual tests : https://pkgdown.r-lib.org/articles/index.html The presentation could stay minimal to check technical issues
• Or maybe build some examples in the gallery like in a way https://pkgs.rstudio.com/flexdashboard/articles/examples.html (maybe more work to build interesting example)