zsh profiling and optimization in 900 easy steps

- Dotfiles: https://github.com/wincent/wincent - zshrc: https://github.com/wincent/wincent/blob/85fc42d9e96d408a/aspects/dotfiles/files/.zshrc - zsh-async: https://github.com/mafredri/zsh-async - Music: http://www.bensound.com/royalty-free-music - Other episodes: https://wincent.dev/link/screencasts