neovim: install oil.nvim plugin

neovim/.config/nvim/after/plugin/oil.lua

@@ -0,0 +1,15 @@
+local oil = require("oil")
+
+oil.setup({
+  default_file_explorer = false,
+  skip_confirm_for_simple_edits = true,
+  columns = {},
+})
+
+vim.keymap.set("n", "<leader>o", function()
+  if vim.bo.filetype == "oil" then
+    oil.close()
+  else
+    oil.open()
+  end
+end)