Website improvements

Improvements were made to the site contents and functionalities:

A bibliography has been added for each painting
A list of exhibitions has been added for each painting
Bredius numbers have been added to the Paintings overview page
A “show/hide remark(s)” functionality has been added to the pages on Provenance and History of conservation & research
Longer texts are now presented with paragraph- and bullet list formatting

New content is to be launched soon.