Update README and flake.nix

README: inform users about breaking changes (due to the font change)
flake: attempt to install the bootstrap-icons font

README.md

@@ -21,6 +21,11 @@
   </a>
 </p>
 
+
+> ⚠️ **BREAKING CHANGE:**  
+> We transitioned from using Material Symbols to Bootstrap Icons, that means you will have to install the new font.
+---
+
 A sleek and minimal desktop shell thoughtfully crafted for Wayland, built with Quickshell.
 
 Features a modern modular architecture with a status bar, notification system, control panel, comprehensive system integration, and more — all styled with a warm lavender palette, or your favorite color scheme!
@@ -66,7 +71,7 @@ Features a modern modular architecture with a status bar, notification system, c
 - `quickshell-git` - Core shell framework
 - `ttf-roboto` - The default font used for most of the UI
 - `inter-font` - The default font used for Headers (ex: clock on the LockScreen)
-- `ttf-material-symbols-variable-git` - Icon font for UI elements
+- `ttf-bootstrap-icons` - Icon font for UI elements
 - `gpu-screen-recorder` - Screen recording functionality
 - `brightnessctl` - For internal/laptop monitor brightness
 - `ddcutil` - For desktop monitor brightness (might introduce some system instability with certain monitors)