Update Readme

[thatgibbyguy]

The project is somewhat out of date and would have to be refactored to use the latest gulp. Therefore the readme should include what you'll need to run this project as a standalone:

• node v 10 or below
• gulp v 3.9 or below

[ianmiller347]

What if we refactor it to not require gulp?

For scss to css files: https://github.com/sass/node-sass

For prefixing: https://www.npmjs.com/package/autoprefixer

This may help reduce some overhead.

Is there any other need for sticking with gulp?

[thatgibbyguy]

Only requirement of gulp is that it's already in the project, I'm totally down with switching to those two packages. What we'd have to do, though, is make scripts for each use case that gulp has right now.

I'd also like to make the plyEssentials task be the actual "ply" package to strip it down to necessities only.

Do you want to take ownership of this one?