feat: allow closing with `q`

[calebdw]

Hello!

This PR adds q to the list of exit commands---q is a common key used by many programs to exit such as:

• less
• man pages
• vim/neovim
• top/htop/btop
• lookatme
• lazygit
• etc.

This allows both <c-c> (the SIGINT signal) and q (the common exit key) to exit presenterm.

Thanks!

[calebdw]

Thank you sir!