Common/starship: remove catppuccin preset

The catpuccin nix module already does this

roles/common/programs/starship.nix

@@ -5,9 +5,6 @@
 }:
 with lib;
 with builtins; let
-  catppuccinFlavour = "mocha";
-  catppuccinStarship = pkgs.catppuccin + /starship/${catppuccinFlavour}.toml;
-
   presets = {
     nerdFontSymbols = pkgs.fetchurl {
       url = "https://starship.rs/presets/toml/nerd-font-symbols.toml";
@@ -31,7 +28,6 @@ in {
     enable = true;
     settings = mergeAllAttrSets [
       (readTomlPreset presets.nerdFontSymbols)
-      (readTomlPreset catppuccinStarship)
       {
         nix_shell = {
           disabled = false;
@@ -45,7 +41,6 @@ in {
           truncation_length = 6;
           truncation_symbol = ".../";
         };
-        palette = "catppuccin_${catppuccinFlavour}";
       }
     ];
   };