Add /freebie and /freebie-thanks pages for the PDF lead magnet

/freebie reuses the courses/single layout (hero + signup form, same
mechanism as find-your-right-readers) via type: "courses" in front
matter, which controls layout lookup independently of the page's actual
URL — so the signup form is free, without the URL reading as
/courses/... for a single-PDF page. /freebie-thanks is a plain page
whose download link points at the new downloads.reground.org bucket.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

content/freebie/index.md

@@ -0,0 +1,15 @@
+---
+title: "Three Steps to Find Your Right Readers"
+description: "A free, no-fluff PDF for fiction authors: three concrete steps to find the readers who actually want your stories, instead of guessing and hoping."
+type: "courses"
+eec_slug: "three-steps-find-your-right-readers"
+
+# Optional italic line under the title, for handling an objection up front.
+hero_subhead: "Three concrete steps to find the readers who actually want your stories — free PDF, no fluff, sent straight to your inbox."
+
+# Optional label on every "Send me day one" button across the page.
+cta_text: "Send me the PDF"
+
+# Optional heading above the repeated signup form at the bottom of the page.
+repeat_cta_heading: "Ready to find your right readers?"
+---