docs: Minor tweaks + use roxygen Markdown + bring dev mod auto.

[olivroy]

Also fix #910.

Enabling roxygen markdown doc with usethis::use_roxygen_md() will help a little. I didn't run roxygen2md::roxygen2md() because the diff would have gotten too big.

I couldn't really find how to download directly.

Error in ncdf4::nc_open(filename, readunlim = FALSE, suppress_dimvals = TRUE) : 
Error in nc_open trying to open file https://rstudio.github.io/leaflet/nc/oisst-sst.nc (return_on_error= FALSE )

[schloerke]

I didn't run roxygen2md::roxygen2md() because the diff would have gotten too big.

If this is an automated call, I'd be up for an isolated PR with a single commit of just the changes from the auto conversion.

Could it be a follow up PR? Or does it need to happen before this one?

If it looks too crazy, we can back out... but I'm still curious.

[schloerke]

I am sorry about the windows install failures. I'll try to fix that tomorrow. Looks like it's trying to install tools 4.2 when it needs 4.3

[olivroy]

I didn't run roxygen2md::roxygen2md() because the diff would have gotten too big.

If this is an automated call, I'd be up for an isolated PR with a single commit of just the changes from the auto conversion.

Could it be a follow up PR? Or does it need to happen before this one?

If it looks too crazy, we can back out... but I'm still curious.

I can do follow-up ! It is mostly automated, but requires some clean-up afterwards. But never a good idea to mix opinionated changees with automated ones as they can get lost!