[zsh] tmp: use pushd instead of cd for switching to directory
[zsh] tmp: use pushd instead of cd for switching to directory

Now that we are using pushd, once we are done with everything that we
want to do in the tmp directory, we can just call popd and go back to
where we were before.

meain/dotfiles,meain/dotfiles,meain/dotfiles,meain/dotfiles,meain/dotfiles,meain/dotfiles