widget to copy license with selected provisions

[mscarey]

There should be a button to copy the selected version of the license to the clipboard. This should come along with clearer instructions about exactly where to put the license to use it.

[mscarey]

I set this up by loading turndown using the unpkg CDN. It failed the first time I tried to use it, but seems okay now.

The interface is a bit awkward because you have to scroll to the top to choose which clauses you want, then scroll to the bottom, click a button, click inside the textarea, select all, and then copy.