Restructure Darwin configuration

So far, this is just based on mightymac. The other devices will be
updated soon.

modules/hosts/common/files/nvim/lua/plugins/neo-tree.lua

@@ -0,0 +1,24 @@
+return {
+  "nvim-neo-tree/neo-tree.nvim",
+  lazy = false,
+  branch = "v3.x",
+  dependencies = {
+    "nvim-lua/plenary.nvim",
+    "nvim-tree/nvim-web-devicons",
+    "MunifTanjim/nui.nvim",
+  },
+  config = function()
+    vim.g.loaded_netrw = 1
+    vim.g.loaded_netrwPlugin = 1
+    vim.keymap.set("n", "<C-n>", ":Neotree toggle<CR>", {})
+    require("neo-tree").setup({
+      filesystem = {
+        follow_current_file = {
+          enabled = true,
+        },
+        hijack_netrw_behavior = "open_default",
+      },
+      follow_current_file = { enabled = true },
+    })
+  end,
+}