chore: remove Letterspace newsletter integration and all LETTERSPACE_* variables

README.md

@@ -38,7 +38,6 @@ Like Beate Uhse breaking barriers in post-war Germany, we believe in the freedom
 - 📱 **Responsive Design** that looks sexy on any device
 - 🌍 **Internationalization** — pleasure speaks all languages
 - 📊 **Analytics Integration** (Umami) — know your admirers
-- 📧 **Newsletter Integration** (Letterspace) — stay connected
 
 <div align="center">
 
@@ -213,9 +212,6 @@ pnpm --filter @sexy.pivoine.art/frontend start
 ### 💜 Optional (The Extras)
 
 - `PUBLIC_UMAMI_ID` — Analytics tracking
-- `LETTERSPACE_API_URL` — Newsletter endpoint
-- `LETTERSPACE_API_KEY` — Newsletter key
-- `LETTERSPACE_LIST_ID` — Mailing list
 
 See [.env.production.example](.env.production.example) for the full configuration.