Convert to Quarto

[EllaKaye]

Now that the R Dev Guide has been converted to Quarto, I propose we do the same for the R Contributor site.

Advantages (all of which come out the box with Quarto):

• search
• dark mode
• a more modern appearance

Also, I suspect that Quarto is better known/understood in the R contributor community than Jekyll, so it could make it easier for others to contribute. It will make previewing locally easier as well.

Since most of the site is written in .md files, the conversation should be as straightforward as replacing _config.yml with a _quarto.yml, then publishing through a gh-pages branch with a GHA. (I'm not sure how the publishing currently works - presumably some combo of the Gemfile and CNAME).

I'm happy to do this and submit a pull request if there's interest.

Also, I'd like to propose that we take this as an opportunity to to develop a brand for R Contributors that can be applied through a brand.yml file - I'll raise a separate issue about that.

[hturner]

Good idea!