I have finally gotten round to adding more photos to this website that I have taken. You can see the photo collections here.
I have a number of Raspberry PIs (3b & 4b) which run this website and a Plex Media Server On my Plex Media Server I have created a number of play lists into which I have added the photos I want to display on this website. I have written a small C# program that will download all the images in a specified play list on my Plex Media Server to a directory on my web site. I run this program for each play list that I have over night and it means that if I add new photos to the collections, the website will get the updated photos over night.
I might release this program at some point.