feat(theming): add catppuccin, dracula, nord, tokyonight themes

internal/theming/assets/catppuccin/zellij.kdl

@@ -0,0 +1,35 @@
+theme "catppuccin-mocha"
+default_layout "default"
+default_mode "normal"
+pane_frames false
+simplified_ui true
+mouse_mode false
+
+keybinds {
+    shared {
+        bind "Alt h" { MoveFocusOrTab "Left"; }
+        bind "Alt l" { MoveFocusOrTab "Right"; }
+        bind "Alt j" { MoveFocus "Down"; }
+        bind "Alt k" { MoveFocus "Up"; }
+        bind "Alt n" { NewPane "Down"; }
+        bind "Alt v" { NewPane "Right"; }
+        bind "Alt f" { ToggleFloatingPanes; }
+        bind "Alt t" { NewTab; }
+    }
+}
+
+themes {
+    catppuccin-mocha {
+        fg "#cdd6f4"
+        bg "#1e1e2e"
+        black "#181825"
+        red "#f38ba8"
+        green "#a6e3a1"
+        yellow "#f9e2af"
+        blue "#89b4fa"
+        magenta "#cba6f7"
+        cyan "#94e2d5"
+        white "#bac2de"
+        orange "#fab387"
+    }
+}