[Accessibility issue] Vignettes lacks alt= in plots

[MichaelChirico]

We have a tool that flags images that lack an alt= attribute. See https://help.siteimprove.com/support/solutions/articles/80000863904-accessibility-image-alt-text-best-practices -- these are essential for conveying the image contents to users on screen readers.

You can add these to your vignettes by using the recent-ish fig.alt chunk option in knitr; see https://www.rstudio.com/blog/knitr-fig-alt/.

The vignettes at issue are https://github.com/easystats/insight/blob/main/vignettes/insight.Rmd (5x) and https://github.com/easystats/insight/blob/main/vignettes/export.Rmd (1x)

Unfortunately the lines are flagged in the HTML output, which won't correspond exactly to the .Rmd file lines, but I assume if you're familiar with the vignette it will be clear which images need it.

Here's a dump of the output on the HTML vignettes:

insight/inst/doc/export.html:426
# ---
insight/inst/doc/insight.html:387
insight/inst/doc/insight.html:420
insight/inst/doc/insight.html:429
insight/inst/doc/insight.html:438
insight/inst/doc/insight.html:448

[IndrajeetPatil]

Thanks, @MichaelChirico! Wasn't aware of the new fig.alt chunk option.

I am moving this issue to the meta-package repo, so that we make sure that we are addressing this concern for all 10 packages in the ecosystem.

[IndrajeetPatil]

Also related to easystats/see#127.