Add warning

README.md

@@ -1,3 +1,7 @@
+> [!WARNING]  
+> Instead of using a different branch for different modifier symbols, a configuration property has been introduced.
+> You should consider switching to the `main` branch as this one will no longer receive updates.
+
 # Dongle Display
 
 This module repository provides a ZMK shield that replaces the built-in status screen with a custom screen designed for 128x64-pixel OLED displays.
@@ -65,4 +69,4 @@ CONFIG_ZMK_DONGLE_DISPLAY_DONGLE_BATTERY=y
 - [case2](/cases)
 - [PCB with OLED and reset button breakouts](https://github.com/spe2/zmk_dongle_hardware)
 - [Macintosh](https://makerworld.com/en/models/403660)
-- [Redox](https://makerworld.com/en/models/242951)
+- [Redox](https://makerworld.com/en/models/242951)