README.md: Move screenshots to the flathub repo

README.md

@@ -1,9 +1,9 @@
 # Satellite
 
-![The main view with a GPS fix](https://codeberg.org/tpikonen/satellite/raw/branch/main/data/screenshots/screenshot3.png)
-![Logging](https://codeberg.org/tpikonen/satellite/raw/branch/main/data/screenshots/screenshot2.png)
-![Expanded satellite SNR view](https://codeberg.org/tpikonen/satellite/raw/branch/main/data/screenshots/screenshot5.png)
-![Speedometer and track recording](https://codeberg.org/tpikonen/satellite/raw/branch/main/data/screenshots/screenshot-track.png)
+![The main view with a GPS fix](https://github.com/flathub/page.codeberg.tpikonen.satellite/raw/master/screenshot-fix.png)
+![Logging](https://github.com/flathub/page.codeberg.tpikonen.satellite/raw/master/screenshot-log.png)
+![Expanded satellite SNR view](https://github.com/flathub/page.codeberg.tpikonen.satellite/raw/master/screenshot-snr.png)
+![Speedometer and track recording](https://github.com/flathub/page.codeberg.tpikonen.satellite/raw/master/screenshot-track.png)
 
 Satellite is an adaptive GTK / libhandy application which displays global navigation satellite system
 (GNSS: GPS et al.) data obtained from [ModemManager](https://www.freedesktop.org/wiki/Software/ModemManager/)