Add option in make-live.R to only render

[cansavvy]

In reference to the RNA-seq/00c-tximeta-other-species.Rmd, it would be nice if it was rendered automatically but it is not a document that will be covered in lectures so we don't need a live version:

If we add it to the rendering list, we will need an option to not do the -live part. We would also need to add its files to S3, which is not necessarily a problem... It is probably worth filing an issue to add an option to make-live.R, but for now manual should be fine.

Originally posted by @jashapiro in #379 (comment)

[jashapiro]

We can also use this to render RNAseq/setup/04-nb_cell_line_tximeta.Rmd as part of automation, which will allow us to remove RNA-seq/data/NB-cell/tximport/NB-cell_tximeta.RDS from S3...