We usually create nested controllers with the main controller as the module,
and the nested controller as the specialization, e.g. Users::DeletionsController
or Traces::IconsController.
This then leaves the topic of whether the feed resource is plural, and whether we
are then showing a singular feed or showing a list (index) of objects.
The routes are carefully named so that we have `changesets_comments_feed_path` (the
comments feed for all changesets) vs `changeset_comment_feed_path(changeset)` (the
comments for a singular changeset).
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