Add Intro to R for RNA-Seq Analysis

[raynamharris]

PR Checklist

• [x] Release label added
• [x] PR category label added
• [x] PR mergeable
• [x] Clean build logs
• [x] Linked related issues #532
• [x] Colorblindness test https://www.toptal.com/designers/colorfilter/

PR Description

Adds the R lesson from recent workshops and a hackathon

Preview link

https://cfde-training-and-engagement--535.com.readthedocs.build/General-Tools/R-for-RNA-Seq/

Review format

Please check

• [x] spelling
• [x] hyperlinks
• [x] code formatting
• [x] readability

Timeline

For June 15 release

[jeremywalter]

Things that might need attention: visualize.md --> in the geom_point()section there are a series of plots, the first two are explicitly explained (initial plot and inverse log)... three more plots follow that aren't captioned/explained in the text.

[raynamharris]