See inveniosoftware/product-rdm#223 and #3100

• Ensure all components/fields used in the deposit form have a logical nested structure of Overridables. Currently, some fields have them, some don't have any, and some don't provide enough granular customisability. The aim is to avoid changing existing IDs where possible but using a logical structure for new ones.

• Experiment with helper utilities for overriding common behaviour (e.g. making fields read-only or hidden in a universal consistent way)