2021-01
All dates of images must be full 10 digits: 2021-01-00 even if exact date is not known.
Generic images-- like book covers, theatre show banners, etc., should have date of event regardless of date of photo.
Standard formats:
images/2010s/thumbs/2018-07-13-havre-saint-pierre.png
icons/orange.png
Every folder should have a default.png as an option.
First image is always in "fullsized"; thumb can be created later and given same name and put in \thumbs.