Move Twig comments into Markdown files

[evanmwillhite]

Can duplicate from Twig files, but it would be helpful to make them more readable.

[amazingrando]

I'm okay with moving the comments into markdown files so that they display in Pattern Lab, since they will be adjacent to the files while working on them.

@ccjjmartin You mentioned in #61 that you'd like comments to go with twig files. Does this solution satisfy that or do you have a preference for the comments to be in the twig files?

[ccjjmartin]

Having them display in pattern lab seems to be the best solution here, so disregard any mention of putting them in the twig files.