[CHORE] Consider renaming custom nonce header with RFC6648 recommendation

[1Copenut]

c3-eleventy/functions/_middleware.js

Line 15 in 9f11dad

response.headers.set("cf-nonce-generator", "HIT");

has a custom header I created for HTTP 200 Success calls where a custom nonce was rolled. RFC6648 provides guidance about using a domain name to reduce the likelihood of collisions:

Note: If the relevant parameter name space has conventions about
associating parameter names with those who create them, a parameter
name could incorporate the organization's name or primary domain name

https://www.rfc-editor.org/rfc/rfc6648