Use the word 'transform' more consistently on DESeq2 steps

[cansavvy]

Purpose:

Closes #220

Strategy

I looked through the RNA-seq examples and looked for the sections where we applied DESeq2 transformations. I then searched and replaced those sentences that only mentioned normalization to mention transformation and link to the 00-rnaseq.html transformation section for more info.

I also found one TODO for a link to the rna-seq clustering heatmap link that I fulfilled.

And then of course, I ran snakemake on the docker container for re-rendering.

Concerns/Questions for reviewers:

Should I drop the word normalize entirely from these sections (I have not because I think people are more familiar with that word, so I kept it but added "transformation). So now everything says normalize and transform.

[cbethell]

Looks good to me @cansavvy! Just one suggestion to propagate the wording to the comments in the code chunk, otherwise 🚀

[jaclyn-taroni]

Seems fine!