a suggestion on content delivery as well: I've had a couple of judges say that they really like to see twitter feeds in addition to however you deliver team news on your site. a facebook page is pretty handy as well, I find that I can have media and news up a lot faster between the two than I can on the website, at least with the way we currently are set up. though none of this is necessary and is completely up to your discretion
otherwise, I'd recommend:
- team history (if applicable, might not be if you're a young team)
- how to join
- information on FIRST
- current news
- information on the competitions you're attending
- resources that would be useful to your own members and other teams (tutorials, references, etc)
- pictures of people, the robot, people working on the robot, etc, though keep it relatively sparse on content pages. save the large batches of images for a gallery so you don't overwhelm your viewers
and make sure you keep it up to date as best you can. the more stagnant it becomes, the worse (I'm guilty of this myself. I've become more interested in my project to replace it that I've been neglecting our current site a bit). the social media helps a bit with this