update: use catppuccin

lua/plugins/colorscheme.lua

@@ -0,0 +1,10 @@
+return {
+  { "catppuccin/nvim" },
+
+  {
+    "LazyVim/LazyVim",
+    opts = {
+      colorscheme = "catppuccin",
+    },
+  },
+}