feat(vim): add the oil file management plugin

This is the plugin I have been using for a while now. I think its much
nicer to use than a tree style. Treating the filesystem as a buffer is
something I used in emacs and have come quite used to.

modules/nvim.lua

@@ -48,6 +48,7 @@ local start_plugins = {
   ["cmp-cmdline"] = { url = "https://github.com/hrsh7th/cmp-cmdline.git", revision = "main" },
   ["copilot"] = { url = "https://github.com/zbirenbaum/copilot.lua.git" },
   ["copilot-cmp"] = { url = "https://github.com/zbirenbaum/copilot-cmp.git" },
+  ["oil.nvim"] = { url = "https://github.com/stevearc/oil.nvim.git" },
 }
 
 local opt_plugins = {

site-modules/core/files/vim/plugin/oil.lua

@@ -0,0 +1,15 @@
+local oil = require "oil"
+
+-- A list of file or directory names that will never be shown in the oil view
+local always_hidden = { [".git"] = true }
+
+oil.setup {
+  view_options = {
+    show_hidden = true,
+    is_always_hidden = function(name)
+      return always_hidden[name] or false
+    end,
+  },
+}
+
+vim.keymap.set("n", "-", oil.open, { desc = "Open parent directory" })