Send a toot with the last feed entry immediately after following a feed

[infinea]

Subscribing to a feed can be frustrating as the feed might not change for some time. It means that the user starts following the feed, and nothing happens for days or even weeks.

The onboarding experience would be much nicer if the parrot immediately sent a toot with the last entry of the feed.

[gugray]

This makes a lot of sense, thanks!