Quarto vignettes instead of R/Markdown

[zeileis]

Niki @freezenik & Mikis @mstasinopoulos, following the discussion in #6 I have moved all .Rmd vignettes to .qmd now. I've adapted the output format and vignette builder accordingly. Also the DESCRIPTION now has quarto instead of knitr in the Suggests and VignetteBuilder. Finally, I excluded all vignettes (except gamlss2.qmd) from building in the package.

[freezenik]

Merged branches

[zeileis]

Niki @freezenik, here's what happened:

• You had just "closed" the PR with the comment "Merged branches". That's why nothing was merged.
• I have simply re-opened the PR but the GitHub Action failed.
• So I added eval=FALSE to the last code chunk in spatial.qmd because it (a) had a hanging library (without a package name) and (b) the st_read() call fails. I added #FIXME# comments in the problematic lines.
• Now the GitHub Action completes successfully again.

The next step for you is to click on the little arrow next to the big green button "Merge pull request" and select "Squash and merge". This will actually merge the branches. Afterwards you can delete the quarto-vignettes branch using the button that appears here.