This plugin, when activated, will add a <link> to the <head> of an Author
page with rel="me", if that author has set a "Website" in their profile.
This can be useful for things like Mastodon URL verification.
If an author has set their website to https://www.example.com, this plugin
will add the following HTML to the <head> on their author page:
<link rel="me" href="https://social.example/@evelyn" />
To verify with Mastodon etc., the author would need to use the URL to their
Author archive page, typically something like
https://www.your-site.example/author/evelyn.