🪛 Unstable in home-manager, new wallpapers, .NET

- Added unstable overlay in order to fetch pkgs from unstable
- Changed Zed-editor to unstable
- Commented turn off screen timeout, still buggy
- Added new Catppuccin wallpapers
- Changed secondary colours on lock screen to fit wallpaper
- Removed <i/> on lock screen
- Added Rider, .NET 9 adn ASP.NET 9
- Readded EDITOR env to nvim

theme.nix

@@ -22,6 +22,7 @@ rec {
   skyAlpha = "89dceb";
   sapphireAlpha = "74c7ec";
   blueAlpha = "89b4fa";
+  blueRgb = "rgb(${blueAlpha})";
   lavenderAlpha = "b4befe";
   textAlpha = "cdd6f4";
   textRgb = "rgb(${textAlpha})";