Increase number of image per record

[jamieu]

Currently limited to 25, need to check what the upper limit can be while still allowing pages to load responsively on older devoices and mobile.

This record has 378 images assigned, yet the CIIM is only publishing the first 25 to the public index. https://collection.sciencemuseumgroup.org.uk/objects/co423003/doncaster-works-collection-of-photographs-collection-of-photographs