Replace desktop demo video with launcher and activity screenshot

site/README.md

@@ -15,7 +15,7 @@ python3 -m http.server 8080 --bind 127.0.0.1 --directory build/site
 Open http://localhost:8080 for the homepage. Rebuild and refresh the browser
 after changing the site sources.
 
-- `site/index.html`, `site/home.css` and `site/home.js`: homepage and desktop video.
+- `site/index.html` and `site/home.css`: homepage and desktop screenshots.
 - `site/styles.css`: shared dark appearance, typography and navigation.
 - `docs/*.md` and its configuration/development topic directories: guide sources published to the wiki.
 - `scripts/build-site.py`: copies homepage assets and writes handbook redirects.
@@ -59,10 +59,8 @@ when no custom wallpaper is set. Settings keeps both defaults available below
 the current wallpaper preview.
 
 Screenshots live in `docs/images/screenshots` and are shared by the README and
-website. Full captures retain their original 2880×1800 resolution, while the
+website. Full captures retain their original resolution, while the
 homepage uses smaller WebP versions for narrower screens.
 
-The hero recording is `site/assets/videos/ferese-demo-2x.mp4`, with its poster
-beside it. Playback is encoded at twice the recorded speed. The player starts
-muted, has standard playback controls, and waits for a click when reduced motion
-is enabled. The site build copies both files without re-encoding them.
+The main desktop image is `docs/images/screenshots/ferese-desktop.png`.
+The README and homepage use the same screenshot.