docs(readme): add Substack

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* [trashmail.com](https://www.trashmail.com) - Free disposable email addresses with forwarding and automatic address expiration
* [Sender](https://www.sender.net) Up to 15 000 emails/month - Up to 2 500 subscribers
* [Buttondown](https://buttondown.email/) — Newsletter service. Up to 1,000 subscribers free
* [Substack](https://substack.com) — Unlimited free newsletter service. Start paying when you charge for it.
## CDN and Protection