This reverts commit b442ce31.

Also, remove popper.js from this script since it's not present in the repo.

We can achieve the same very easily.

With the current docs directory setup, I'm making too many mistakes and have to manually address path changes and directory moves on deploy. This makes for a frustrating experience developing locally and shipping releases. With this PR, we're basically back to the same setup from v3—duplicating the dist directory into our docs directory. Not the most ideal, but very straightforward for me as the release manager.

* Update copyright range to include 2018

* Extend copyright date range on new files from 2017 to include 2018