Switch to new lazy-based config

Still a bit WIP. Gradually adding back old plugins and config from old config.

lua/plugins/oil.lua

@@ -0,0 +1,8 @@
+return {
+  "stevearc/oil.nvim",
+  opts = {},
+  dependencies = { "nvim-tree/nvim-web-devicons" },
+  keys = {
+    { "-", "<cmd>Oil<cr>", { desc = "Open parent directory in current buffer" } },
+  },
+}