add neotree configs and remove redundant stuff

lua/plugins/neo-tree.lua

@@ -0,0 +1,18 @@
+return {
+  'nvim-neo-tree/neo-tree.nvim',
+  opts = function(_, opts)
+    opts.filesystem.filtered_items = {
+      visible = true,
+      always_show = { -- remains visible even if other settings would normally hide it
+        '.gitignore',
+      },
+      always_show_by_pattern = {
+        '.env*',
+      },
+      never_show = { -- remains hidden even if visible is toggled to true, this overrides always_show
+        '.DS_Store',
+        --"thumbs.db"
+      },
+    }
+  end,
+}