add new nvim files

config/nvim_old/lua/plugins/headlines.lua

@@ -0,0 +1,27 @@
+return {
+  "lukas-reineke/headlines.nvim",
+  opts = function()
+    local opts = {}
+    for _, ft in ipairs({ "markdown", "norg", "rmd", "org" }) do
+      opts[ft] = {
+        headline_highlights = {},
+        -- disable bullets for now. See https://github.com/lukas-reineke/headlines.nvim/issues/66
+        bullets = {},
+      }
+      for i = 1, 6 do
+        local hl = "Headline" .. i
+        vim.api.nvim_set_hl(0, hl, { link = "Headline", default = true })
+        table.insert(opts[ft].headline_highlights, hl)
+      end
+    end
+    return opts
+  end,
+  ft = { "markdown", "norg", "rmd", "org" },
+  config = function(_, opts)
+    -- PERF: schedule to prevent headlines slowing down opening a file
+    vim.schedule(function()
+      require("headlines").setup(opts)
+      require("headlines").refresh()
+    end)
+  end,
+}