Move autopairs example from README to an optional plugin

README.md

@@ -106,36 +106,6 @@ information about extending and exploring Neovim.
 
 NOTE: You'll need to uncomment the line in the init.lua that turns on loading custom plugins.
 
-<details>
-  <summary>Adding autopairs</summary>
-
-This will automatically install [windwp/nvim-autopairs](https://github.com/windwp/nvim-autopairs)
-and enable it on startup. For more information, see documentation for
-[lazy.nvim](https://github.com/folke/lazy.nvim).
-
-In the file: `lua/custom/plugins/autopairs.lua`, add:
-
-```lua
--- File: lua/custom/plugins/autopairs.lua
-
-return {
-  "windwp/nvim-autopairs",
-  -- Optional dependency
-  dependencies = { 'hrsh7th/nvim-cmp' },
-  config = function()
-    require("nvim-autopairs").setup {}
-    -- If you want to automatically add `(` after selecting a function or method
-    local cmp_autopairs = require('nvim-autopairs.completion.cmp')
-    local cmp = require('cmp')
-    cmp.event:on(
-      'confirm_done',
-      cmp_autopairs.on_confirm_done()
-    )
-  end,
-}
-```
-
-</details>
 <details>
   <summary>Adding a file tree plugin</summary>