switched to lazy.nvim and clean up a bit

lua/plugins/tree.lua

@@ -0,0 +1,32 @@
+return {
+    {
+        'nvim-neo-tree/neo-tree.nvim',
+        branch = "v2.x",
+        dependencies = {
+            'nvim-lua/plenary.nvim',
+            'kyazdani42/nvim-web-devicons',
+            'MunifTanjim/nui.nvim'
+        },
+        config = function()
+            vim.cmd [[ let g:neo_tree_remove_legacy_commands = 1 ]]
+            require('neo-tree').setup {
+                close_if_last_window = true,
+                filesystem = {
+                    filtered_items = {
+                        visible = true,
+                    },
+                },
+                window = {
+                    width = 25,
+                    mappings = {
+                        ["e"] = "none",
+                        ["j"] = "toggle_auto_expand_width",
+                    }
+                },
+            }
+
+            local u = require 'config.utils'.mapping
+            u.cmd('<leader>e', 'Neotree toggle')
+        end
+    }
+}