If you type the address into the address bar it will still take you there, and it is still a functioning site once there you can post and reply, so I think just the link disappeared, not the actual page.
Thanks needs to go to Emzi00 as well because she is the one who first discovered you could still get there by typing the address in the address bar, once I was there I just tried responding to some posts and I could.
This is Austins response
"We still have groups, it's just on the navbar any more. I'm trying to remove the clutter and a program I set up for clicks said that was barely used in comparison to the other buttons.
I don't like making changes, but when I do it's to aid in functionality r design."