document workflow tips

[joshuahhh]

I was happy to discover that Skim supports automatically reloading PDF files when they change on disk. A configuration change is required: see https://skim-app.sourceforge.io/manual/SkimHelp_38.html, but also select "Reload automatically". (Preview will sometimes do this, but it is unreliable, and you will often lose your place in the PDF.)

I think it would be helpful for living-papers to document some workflow niceties like this -- whatever is required to approximate the user experience of Overleaf, anyway.