refactor: minor restructure to move logic out of main controller file to src/api

src/api/index.js

@@ -11,6 +11,7 @@ module.exports = {
 	categories: require('./categories'),
 	search: require('./search'),
 	flags: require('./flags'),
+	activitypub: require('./activitypub'),
 	files: require('./files'),
 	utils: require('./utils'),
 };