feat(ui): improve ui (cmp) and add gruvbox theme

lua/plugins/secondary/init.lua

@@ -22,6 +22,9 @@ return {
 		"lukas-reineke/indent-blankline.nvim",
 		main = "ibl",
 	},
+	{
+		"sainnhe/gruvbox-material",
+	},
 	{
 		"savq/melange-nvim"
 	},