feat: ability to browse to any ActivityPub note and have the entire topic chain render

Added methods for going up the inReplyTo chain to parent, asserting the topic, etc.

src/controllers/activitypub/index.js

@@ -10,6 +10,7 @@ const helpers = require('../helpers');
 const Controller = module.exports;
 
 Controller.profiles = require('./profiles');
+Controller.topics = require('./topics');
 
 Controller.getActor = async (req, res) => {
 	// todo: view:users priv gate