Add rye to .zprofile instead of .profile when running zsh

[dnlbauer]

Currently, rye defaults to adding itself to the PATH by a line in .profile. However, this does not work if the user is using ZSH because ZSH does read from .zprofile instead of .profile by default. With ZSH being one of the most used shells, it would be nice to see rye's installation script to support this.