Removes non-Component files from export files list.

David Chandek-Starkrequested to merge
remove-non-exportable-files into main

This includes "IIIF file" and "structural metadata".

The export files page has also been re-titled "Export Component Files" to clarify what it does.

These changes were motivated by, but do not resolve, DDK-250.

Edited by David Chandek-Stark

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