Keep shoppers on mozimo.in: internalize all marketing links

- gifting tab CTAs now point at our /collections pages (seed defaults +
  one-off PB migration rewriting shop.mozimo.in cta_urls, idempotent)
- Hero/Footer/our-world/journal 'shop' links -> /chocolate; bespoke
  bulk-ordering -> /gifting#corporate-bulk
- still on Shopify (deliberate, until Phase 2): PDP buy button, Header
  bag+account, footer policies

src/app/journal.$slug.tsx

@@ -93,7 +93,7 @@ function JournalArticle() {
                 </p>
                 <div className="mt-6 flex flex-wrap justify-center gap-4">
                   <a
-                    href="https://shop.mozimo.in/"
+                    href="/chocolate"
                     target="_blank"
                     rel="noopener noreferrer"
                     className="btn btn-dark"