theme: add Catppuccin

.gitmodules

@@ -272,3 +272,6 @@
 [submodule "assets/syntaxes/02_Extra/typst-syntax-highlight"]
 	path = assets/syntaxes/02_Extra/typst-syntax-highlight
 	url = https://github.com/hyrious/typst-syntax-highlight
+[submodule "assets/themes/Catppuccin"]
+	path = assets/themes/Catppuccin
+	url = https://github.com/SchweGELBin/catppuccin-bat-sub.git

tests/assets.rs

@@ -14,6 +14,10 @@ fn all_themes_are_present() {
         themes,
         vec![
             "1337",
+            "Catppuccin Frappe",
+            "Catppuccin Latte",
+            "Catppuccin Macchiato",
+            "Catppuccin Mocha",
             "Coldark-Cold",
             "Coldark-Dark",
             "DarkNeon",