Documentation needs updating

[jwarby]

The documentation is currently very poor. It needs updating to properly explain the plugin's features and how to use them.

As part of this issue, I also vote that we remove all of the demo-related files from the main repository, and create a new demo page in a GitHub pages branch (gh_pages).

[craig0990]

👍

Works for me, although if the demos go, the repo should probably be renamed as well

[craig0990]

Demo pages removed in commit 1df6a19