PHILADELPHIA — After a week off, the Eagles picked up right where they left off. Any notion of rust coming off of the bye week was quickly dispelled in the Eagles’ 35-13 win over the Pittsburgh Steelers on Sunday. It’s the second time in franchise history the Eagles have started the year 7-0 and the first since 2004. Here’s our analysis on the game: Brown’s big dayAfter catching his third touchdown pass of the first half, it looked like A.J. Brown ran out of celebrations. In lieu of an elaborate dance or stunt, Brown simply counted the two defensive backs Pittsburgh deployed to slow him down, …