Random New Items in Hacker News Frontpage

Randomly picks 5 items from the /newest or /shownew and displays them at the top of the front page.

With the growth of HN in recent years, and too few people looking at /newest and /shownew, a lot of good posts, esp. 'Show HNs' disappear in the crowd. This extension picks 5 (customizable) random items from /newest and /shownew (or any one, customizable), and appends them to the top of the frontpage (and it's next pages).