refactor(themes): move colour.rs to komorebi-themes

Cargo.lock

@@ -2676,7 +2676,6 @@ dependencies = [
  "dirs",
  "dunce",
  "getset",
- "hex_color",
  "hotwatch",
  "komorebi-themes",
  "lazy_static",
@@ -2778,6 +2777,7 @@ dependencies = [
  "base16-egui-themes",
  "catppuccin-egui",
  "eframe",
+ "hex_color",
  "schemars",
  "serde",
  "serde_variant",