The Deputy Superintendent ought to be in-charge, at least temporarily. There should be an automatic succession policy. Is there?
The District could take down the superintendent's Welcome and his About page and replace them with factual information about his "resignation". And file all his photos elsewhere.
There's a new guy in charge of Media Relations, and he could craft the announcement and put it out.
But anyone looking at the website today will think that Baron is still the superintendent.