Make rang less about Docker

[chainsawriot]

https://mastodon.social/@eliocamp/111251808081362665/embed

This comment is fair. But can we change that?

The R script generated by export_rang() can run without a container, as long as the R version allows it (renv and groundhog also can't guarantee that). One can set a specific library directory.

rig could be an option too.

[chainsawriot]

One quick idea is to have a vignette like "use rang without containerization"