When unfollowing, the unfollowed users notes are not automatically removed from feeds

[bryanmontz]

Describe the bug

When you follow a user, their notes are immediately and automatically inserted into the feed. However, when you unfollow a user, their notes are not immediately and automatically removed from the feed. You can pull to refresh, and they are removed. From a user expectation perspective, we should do our best to immediately remove them.

To Reproduce

Steps to reproduce the behavior:

1. Navigate to the feed and observe the content of it.
2. Navigate to a user's profile that you don't already follow.
3. Follow that user.
4. Observe that the feed immediately contains their notes.
5. Go back to the profile and unfollow the user.
6. Go back to the feed.
   At this point you will still see their content until you pull to refresh the feed.

Expected behavior

The unfollowed user's notes should have been automatically removed.