Replace neotree with nvim-tree

lua/core/keymaps/async/project-tree.lua

@@ -0,0 +1,24 @@
+-- Neotree mappings
+
+return function(buffer)
+  local api = require "nvim-tree.api"
+
+  local nmap = require("core.utils").createNmap({
+    buffer = buffer,
+    desc = 'nvim-tree: : ',
+    noremap = true,
+    silent = true,
+    nowait = true
+  })
+
+  -- default mappings
+  api.config.mappings.default_on_attach(buffer)
+
+  nmap('<leader><space>', api.tree.toggle, 'File Tree')
+  nmap('t', api.node.open.tab, 'Toggle Node')
+  nmap('<leader>f', function()
+    api.tree.open({
+      find_file = true
+    })
+  end, 'Reveal File In Tree')
+end