Add WorldCat and Google Groups and any domain registrars

[David Paul]

To the list of suggested sites listed on
<https://www.gnu.org/help/help-javascript.html> I would like to add
[WorldCat](https://www.worldcat.org/) (for locating physical books in
libraries) as well as [Google Groups](https://groups.google.com/) (for
finding and reading old Usenet posts).

Additionally, I would like for the ability to register a domain name on
a registrar's website, but I know of no domain registrar that currently
offers a way to do that using solely free JavaScript.

-- 
David