Change the sign in button from cloud.snap to just snap

This could be either a bug or a suggestion. The sign in button on the forum brings you to a cloud.snap.berkeley.edu site instead of a snap.berkeley.edu one. This means that my browser and probably some others say its insecure and doesn't let you load it. I had to delete the "cloud." from the URL just to log in to post this.

Yeah this is on my todo list. I will try to do it tonight and hopefully nothing should break.