Modularize complex plugin configs. Add folding plugin

lua/plugins/neo-tree.lua

@@ -0,0 +1,19 @@
+return {
+  "nvim-neo-tree/neo-tree.nvim",
+  branch = "v3.x",
+  dependencies = {
+    "nvim-lua/plenary.nvim",
+    "nvim-tree/nvim-web-devicons", -- not strictly required, but recommended
+    "MunifTanjim/nui.nvim",
+  },
+  config = function()
+    require('neo-tree').setup {
+      filesystem = {
+        filtered_items = {
+          visible = true,
+          hide_hidden = false
+        }
+      },
+    }
+  end,
+}