Now I've connected Brid.gy and am starting to get more interactions with
Webmentions, I need to start displaying these Webmentions for site
viewers to see.

For likes, we should render a facepile[0] because it doesn't matter as
much how they've liked, just that they have.

However for other webmentions, we do want to have a list of the author
and a link to the webmention.

For each of the webmentions, we want a separate partial that can be
composed easily.

Additionally, we can the partial's context to render a slice of
webmentions.

Part of jvt.me#352.

[0]: https://indieweb.org/facepile