Port from bookdown to quarto

[djnavarro]

Substantive changes

• Converts code chunk options to yaml format
• Fixes issues with placement of level one headers
• Switches the github actions workflow to quarto
• Replaces _bookdown.yml and _output.yml with _quarto.yml
• Uses quarto layouts in place of columns() function (currently only fixes the number of columns, not the size or aspect ratio of plots)

Other changes

• Additional canonicalisation for files that escaped the last round
• .RProj file explicitly enforces sentence level wrapping of markdown
• Adds a status() function to show callouts for each chapter
• set.seed() called consistently in common.R instead of inconsistently in some chapters
• Fixes a couple of broken cross-references

Something confusing

• For reasons that I don't yet understand, I had to slightly change one heading in the springs chapter to prevent quarto from throwing errors. Reproducible locally and on actions, but as yet I haven't managed to isolate it as a minimal reprex: 81c4ae5f1af7b30abae2cb3c341b85e9026f7d9f

Proposed next steps

• PR to rename .Rmd files to .qmd (and rename scripts like common.R to _common.R etc)
• Then return to updating the actual content 😀

[djnavarro]

@hadley okay we have a minimum viable PR (is MVPR an accepted term?) to switch to quarto. As always there are some rough edges. The most noticeable is that the switch from the bespoke columns() function to the quarto layouts chunk option has left us with a lot of plots that need some love on the aspect ratio and size front. There's also a really fkn bizarre quarto bug(?) I had to work around (see above) to make the bloody thing build, but despite its weirdness from a quarto pov it's trivial from the ggplot2 book pov. And of course (as always) there's a lot of smoothing I want to do later but this version works pretty well and I think it's probably wise to merge the MVPR before making a start on the sweet sugary polishes 😀