Non 0-based index in tmux, it's easier
Add a 'desk' and a 'dbox' navigation aliases
Exit from tmux but not from the shell

When I'm on a Mac I can just Cmd+w to shut down an iTerm window, but
sometimes I just want to be out of tmux but still in the shell.
I removed the 'exit' command that zshrc issued just after starting tmux:
that command made the shell exit when exiting from tmux, effectively
never letting me stay out of tmux.
Map ,en ,ep to run current file in prev/next tmux pane