Can we remove Orangelight::Stackmap concern?

[sandbergja]

What maintenance needs to be done?

• Check if we still need the code in the file app/controllers/concerns/orangelight/stackmap.rb
• If we don't need it, delete it

Level of urgency

• High
• Moderate
• Low

Why is this maintenance needed?

This doesn't appear to be called when opening the stackmaps modal. If it is no longer needed, we can simplify the code base a little!