Remove the GitHub Pages publish; Cloudflare Pages serves docs.xmoj-script.uk

The docs Pages project builds master (production) and every PR branch
(previews), and docs.xmoj-script.uk now points to it. test.yml still
build-checks every push and PR.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017dqWu3YgeVRGwBt5pXDq4A

Author: boomzero