Creates a global h2 shortcut for Shopify CLI using shell aliases.
The following shells are supported:
- Bash (using `~/.bashrc`)
- ZSH (using `~/.zshrc`)
- Fish (using `~/.config/fish/functions`)
- PowerShell (added to `$PROFILE`)
After the alias is created, you can call Shopify CLI from anywhere in your project using `h2 <command>`.