Disable edit links in nested table index first column

[jclemans]

Would be nice to be able to turn off the edit links that automatically get added to the first column's content in a nested_table. Currently the only way to do it would be to override the edit controller action to do nothing, or create an overriding nested table partial.

Context: I'm using a nested_index_scaffold to manage imported CSV data. I want to allow these objects to be created in batches, but not edited individually.