neovim: fix a bunch of small issues

- snack explorer now opens on the neovim is open at instead of the go
module
- remove obsolete linting stuff

neovim/dot-config/nvim/lua/config/keymaps.lua

@@ -15,8 +15,9 @@ local function toggle_or_focus_explorer()
     return
   end
 
-  -- No explorer open; open one at the project root
-  Snacks.explorer({ cwd = LazyVim.root() })
+  -- No explorer open; open one at the actual working directory.
+  -- (inside the explorer, <c-r> toggles between project cwd and module root)
+  Snacks.explorer()
 end
 
 vim.keymap.set("n", "<leader>e", toggle_or_focus_explorer, { desc = "Explorer (toggle/focus)" })