nvim: use nvim-origami instead of nvim-ufo

.config/nvim/lua/opts.lua

@@ -27,11 +27,6 @@ vim.o.smartindent = true
 
 vim.o.scrolloff = 3
 
--- for UFO
-vim.o.foldlevel = 99
-vim.o.foldlevelstart = 99
-vim.o.foldenable = true
-
 vim.o.showmode = false
 
 vim.opt.listchars = { tab = "│ ", trail = "␣" }