Describe the bug
I have several subscriptions. Whenever I add a new one, it fetches all latest RSS entries in this feed.
But in the main stream, it only shows this latest subscription, instead of "mixing" its publications with the existing feeds.

To Reproduce
Steps to reproduce the behavior:

1. Have several different feeds
2. Add a new feed
3. Go to main stream and you'll only see the latest feed posts, despite some of them being older than existing ones on your main stream

Expected behavior
The entries in the main stream are sorted by published date, not by "subscription added date" (presumably, when FreshRSS fetched the article is the date it uses to sort by "newest").

Screenshots

Environment information (please complete the following information):
Latest docker image at the time of writing.

Additional context
I am sorry if there is an option in the interface to sort this out, I just didn't find it :\