changed fold method to expression for code based auto folding

lua/options.lua

@@ -17,7 +17,7 @@ vim.opt.spellcapcheck = ""
 vim.o.number = true -- Make line numbers default
 vim.o.relativenumber = true
 vim.o.showmode = false
-vim.o.foldmethod = "indent"
+vim.o.foldmethod = "expr"
 -- Sync clipboard between OS and Neovim.
 --  Schedule the setting after `UiEnter` because it can increase startup-time.
 --  Remove this option if you want your OS clipboard to remain independent.