chore(home-manager): put neovim plugins configuration in a separate directory

modules/home-manager/cli/neovim/files/plugins/neotree.lua

@@ -0,0 +1,20 @@
+local neotree = require 'neo-tree'
+neotree.setup({
+    close_if_last_window = true,
+    filesystem = {
+        filtered_items = {
+            -- when true, they will just be displayed differently
+            -- than normal items
+            visible = false,
+            hide_dotfiles = false,
+            hide_gitignored = true,
+        },
+        follow_current_file = {
+            -- follow file in current buffer even iof the file is
+            -- loaded while tree is open
+            enabled = true,
+            -- do not autoclose expanded dirs
+            leave_dirs_open = true,
+        },
+    }
+})