Support other activitypub instances

[Atn-D]

Can you please add support for external posts from instances other than mastodon please?

• [ ] Misskey and fork (Iceshrimp, Firefish, Sharkey, Foundkey…) #8 use domain.tld/notes/ID
• [ ] Pleroma and fork (Akkoma…) use domain.tld/notice/ID
• [ ] PeerTube use domain.tld/w/ID and domain.tld/videos/watch/ID
• [ ] Friendica & Hubzilla use domain.tld/display/ID
• [ ] PixelFed use domain.tld/p/USERNAME/ID
• [ ] Lemmy use domain.tld/post/ID
• [ ] kbin is complicated but use domain.tld/m/…