[recipe 04]: Applying suggestions

Fixes #44

[x] bulk suggestions/edits/typos/rephrasing
[x] In Motivation: maybe add a link to the CFDE rubric (the "common rubric based on compliance with the C2M2") on FAIRshake and 2) it may be confusing at this point in the documentation how FAIR assessments are related to the C2M2. on the C2M2 comment - maybe say it'll be explained a bit more later in the recipe..
[x] for the images, it's not intuitive that clicking on them takes readers to the FAIRshake page it's showing. very helpful to have these links! either add a note at the top of the recipe to click on the images or a better, add the link in the text about the image.
[x] this image about the metrics page is wonderful. can you also highlight that 'Principle' refers to whether the metric is associated with Fairness, Accessibility, Interop, or Reusability. this helps readers understand where to find info for which metrics are assessing F, A, I, and R

nih-cfde / the-fair-cookbook