Lost our Home Page! Help! :)

Hi Yale Sites Team,

We were trying to upload a new news item at our website,  quantuminstitute.yale.edu but by accident we ended up adjusting something at the home page which now disappeared altogether (it says it cannot find the page and something about url-redirect) and all the news items which were on there. I don’t know where to start to get the home page back. Could you see what happened and even more important ; whether this is fixable?

Thanks!
Stephanie