Automatically setup environment

[yujinyuz]

Now that we are using chezmoi, we should be able to add automatic setups ie download and install brew.

For macOS, save the system preferences:

Reference

• https://www.chezmoi.io/user-guide/use-scripts-to-perform-actions/
• https://github.com/marcus-crane/dotfiles
• https://macos-defaults.com/