Generators seem to be broken

```
$ bundle exec rails g datagrid:scaffold something
Could not find "grid.rb.erb" in any of your source paths. Your current source paths are:
/home/*******/.gem/ruby/3.4.2/gems/datagrid-2.0.1/lib/templates
```

In `lib/datagrid/generators/scaffold.rb:13`
it probably should be
```
source_root File.expand_path("#{__FILE__}/../../../../templates")  # extra ../
```