If you ever come across it - I'd love to find the "MkDocs-Material of Photo Gallery". Structured folders of photos - run one command - a slick, static-HTML site is built. A feature where you could put full-size photos in there, and the tool would automatically generate web-friendly sizes... Keep an eye out (or share here if you know a good one!)

It's just hugo with a custom theme. I run my script to export photo albums from iPhoto, then I add some discussion in markdown.

I'm very old school. I still have a Flickr Pro subscription.