Add SquareSpace Instructions as a provider

[altonbrailovskiy]

Proposed changes

With Squarespace acquiring google domains, I have decided to switch to Cloudflare. It'd be helpful to have instructions for Squarespace configurations both for setting up DNS and transferring the domain entirely.

Subject Matter

DNS + Transfers + DNSEC

Content Location

https://developers.cloudflare.com/fundamentals/setup/manage-domains/add-site/ https://developers.cloudflare.com/dns/dnssec/#disable-dnssec

Additional information

No response