It is possible to load your own commands you want to execute in the `.zshrc`. To add commands you want to execute on shell startup, just add a `localcommands` file with your commands in `~/.dotfiles/zsh/`.
And the great macos realted configs and scripts from Dries Vints (@driesvints) which many parts are heavily copied from. See (https://github.com/driesvints/dotfiles).
Also thanks to @djfhe for his initial customizations of the macos dotfiles.