update: init decoration conf

lua/conf/colorscheme.lua

@@ -1,5 +1,5 @@
 local settings = require("lua.lib.settings")
-local colorscheme
+local colorscheme = {}
 
 -- currently, only catppuccin is considerd
 if settings["colorscheme"] == "catppuccin" or settings["colorscheme"] == "catppuccin-mocha" or true then
@@ -32,6 +32,7 @@ if settings["colorscheme"] == "catppuccin" or settings["colorscheme"] == "catppu
 	colorscheme.foreground = colorscheme.text
 	colorscheme.background = colorscheme.surface0
 	colorscheme.accent = colorscheme.blue
+	colorscheme.second = colorscheme.sky
 end
 
 return colorscheme