Replaces the gumroad_url stub with an on-site embedded checkout (buy
button -> POST to the bookshop backend -> mounted Stripe iframe),
following the existing contact/submissions form's fetch/status-message
pattern. Adds thank-you and resend-link pages, an example book template
(draft), and updates the privacy policy and terms to honestly disclose
Stripe as a third-party payment processor.
Adds top nav links to Books/Authors/Submissions stub pages, and
Contact/Privacy/Terms pages modeled on reground-site's structure. Contact
form posts to the already-provisioned eec-twosquirrelspress backend.
Styling implements the press's brand palette and font choices.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>