Revise PCA plot markdown

If the question is: "Was the experiment successful" and you have arrived at an answer to this question, you have to explain it more.

I feel it is too vague, anyway.

Suggestion: Read the comments and then spend an afternoon or a couple of hours to make some improvements. If you like it better, submit a new PR. If you don't, we can close this.

As far as I am concerned, I feel I can look at the plots and come to my own conclusions about them. I don't need a Markdown to explain it to me, because I can read code and understand it, generally. Someone else might not, however. I would recommend investing at least another half-day in making improvements, but not much more, unless [~molly] thinks more or less is needed.

Moving back to "To-Do" for Molly to review the preceding comments by me, following the most recent comment made by [~molly].

I am happy with it being closed, or worked-on a bit more, as she sees fit.

Branch: https://bitbucket.org/mdavis4290/molly3-flavonoid-rnaseq/branch/IGBF-3369
Pull Request: https://bitbucket.org/hotpollen/flavonoid-rnaseq/pull-requests/19

Notes: Dr. Loraine has already reviewed the cosmetic changes to the PCA plots and this pull request are just the cosmetic code changes to the plots. The commit should only include the new Markdown and output file of the new figures. I will make more changes to the writing later to then also include the knitted PDF. Thanks!

PR is merged. Moving to Done.