docs: update README screenshot

README.md

@@ -10,6 +10,10 @@ It combines app discovery, publisher identity, direct APK distribution, and soci
 
 This repo is the [Flutter](https://flutter.dev) mobile app for [Zapstore](https://zapstore.dev). Listings and publisher identity sync from Nostr relays; APKs are verified (file hash and signing certificate) before install.
 
+<p align="center">
+  <img src="./assets/images/readme-screenshot.png" alt="Zapstore app screenshot" width="720">
+</p>
+
 ## Get the app
 
 [GitHub Releases](https://github.com/zapstore/zapstore/releases) (APK) · Install from Zapstore (badge below)
@@ -20,10 +24,6 @@ This repo is the [Flutter](https://flutter.dev) mobile app for [Zapstore](https:
   </a>
 </p>
 
-<p align="center">
-  <img src="./fastlane/metadata/android/images/zapstore_screenshots/zapstore_screenshot.png" alt="Zapstore app screenshot" width="280">
-</p>
-
 ## Build from source
 
 Flutter **3.38.6** (see [`.fvmrc`](.fvmrc); [FVM](https://fvm.app) optional). Android SDK required for APK builds.