nvim: add folding options (especially for markdown)

dot_config/nvim/lua/core/options.lua.tmpl

@@ -58,3 +58,11 @@ vim.cmd([[ autocmd InsertLeave * call system("fcitx5-remote -c") ]])
 
 
 vim.cmd("set clipboard+=unnamedplus")
+
+
+-- folding
+vim.opt.fillchars = { fold = " " }
+vim.opt.foldmethod = "indent"
+vim.opt.foldenable = false
+vim.opt.foldlevel = 99
+vim.g.markdown_folding = 1 -- enable markdown folding