Move default settings into module. Move neotree into plugins. Add new mappings

lua/custom/plugins/filetree.lua

@@ -1,24 +0,0 @@
--- Unless you are still migrating, remove the deprecated commands from v1.x
-vim.cmd([[ let g:neo_tree_remove_legacy_commands = 1 ]])
-
-return {
-	"nvim-neo-tree/neo-tree.nvim",
-	version = "*",
-	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 = false,
-					hide_dotfiles = false,
-				}
-			}
-		}
-
-		vim.keymap.set('n', '<leader><space>', ':Neotree toggle<cr>', { desc = '(nvim-tree) File tree' })
-	end,
-}