Substack Opt-in Forms

Hi CodeSupply – Love Powerkit and your themes!

I’d like to suggest expanding the functionality of the opt-in forms to include Substack — Although Substack does not have an API, there is an interesting workaround that I’ve discovered here: https://docs.substackapi.com/how-to-add-a-substack-signup-form-to-your-website

Having this additional feature integrated into Powerkit and CodeSupply themes seems like a big win, and I’d appreciate it if you would consider doing so.