add undotree

move vim options to seperate file

lua/plugins/init.lua

@@ -15,6 +15,11 @@ return {
 		build = ':TSUpdate'
 	},
 
+	-- undotree
+	{
+		"mbbill/undotree",
+	},
+
 	-- render-latex
 	{
 		"techwizrd/render-latex.nvim",