Update OSCA links

[sjspielman]

We should consider generally updating links to OSCA to use URLs with release instead of a version, e.g. http://bioconductor.org/books/release/OSCA.basic/ instead of, for example,http://bioconductor.org/books/3.14/OSCA.basic/ etc. In the scRNA-seq module, we have OSCA links in the following notebooks -

• https://alexslemonade.github.io/training-modules/scRNA-seq/05-clustering_markers_scRNA.nb.html
• https://alexslemonade.github.io/training-modules/scRNA-seq/07-gene_set_enrichment_analysis.nb.html
• https://github.com/AlexsLemonade/training-modules/blob/master/scRNA-seq/exercise_01-scrna_quant.Rmd
• https://github.com/AlexsLemonade/training-modules/blob/master/scRNA-seq/exercise_02-scrna_clustering.Rmd

[jashapiro]

This is an interesting question... The advantage of using the versioned link is that it should be more stable. We have seen links in this book move and break in the past. On the other hand, linking to current versions is better for future reference, and if people are coming back to this in the future.

If there were an easy link to the latest version from previous versions (like there is in a readthedocs site), I would be happy with leaving things as they are, but it doesn't seem like that is the case, so I am very torn!

[sjspielman]

I agree, this could go either way and there are fair arguments for both!