I have concerns about the sidebar, it looks a little weird. Part of this is the gradient, and making the sidebar more "flat" helps.
We can finish this off by removing the "fake" borders and adding real ones (giving us consistency), as well as lightning them a little.
I'm more concerned though about the behaviour of the sidebar, as whenever you open a section below an already open section, your cursor ends up in a "random" place (yes, I know it's not really random, but it may as well be for the user). As an example, open the "The Team" section, then try to view a page under "The Game".
Their are many ways to fix this, one of which is to allow the user to open as many sections as they like permanently, another is to keep sections other then the active one open "temporarily" and close the temporary ones on mouseOut. This would leave the active one open, the one the user is most likely using, and remove the inactive ones from focus.
Another issue I have is with your page loading. I like to open multiple things in tabs, and then look through them. Under your system, this is broken, as the pages are loaded using an onClick. I would suggest using hashes (
http://wildcatrobotics.com/#home or
http://wildcatrobotics.com/#team_students) with javascript that, on the pageload, gets the specified page.
This seems like a lot of things, but they’re mostly pretty minor changes. The content looks AMAZING and the site overall looks great. The sidebar was just the only thing that caught my eye design wise and hardest change would probably be the sidebar open/close issue, which isn't saying much.