I decided to make this post to track all improvements that I could find related to News Aggregators page.
Replacing GNOME Feeds which seems to be unmaintained anymore with Newsflash.
Fix syntax formatting for the Examples.
Lastly, not really a problem but something to keep in mind, Feeder closed their issues tracker on Github. And suggests using built-in button “Send a bug report”. Which isn’t great if other users are facing the same issues.