Support for Pleroma

[JustAnotherArchivist]

@ealgase on #43:

Mastodon and Pleroma are both federated alternative social networks that would be useful to support (especially Pleroma as the website is loaded with Javascript so an archivebot won't grab a user). Ideally, users, hashtags, threads, and entire instance timelines would be supported.

[TheTechRobo]

Is it even possible to access a Plemora instance without auth?

[JustAnotherArchivist]

Yes, although I'd be surprised if there wasn't a way to require auth for everything, so some instances might have that.