That's still too broad. A website can hold lots of things, like mail, databases, or whatever info.
But I assume you just mean some kind of personal webpage, blogs or whatever. In that case, you probably want to save some space for /var, since that's where webs usually live, along with mail and databases. Having a separate /home helps when it comes to doing backups of your user's private data... The rest just depends on your concrete needs. Some people like having a separate partition for /boot, /usr/src/, /usr/ or /opt. I don't think that this makes much sense for a home server. But again, it all depends on what exactly do you want, your backup policies, your security requirements, the involved filesystems and many other factors.