Images are uploaded and reordered from the management panel, which lives at a separate address and asks you to sign in with GitHub.
The panel holds two lists: the home page photographs, six of them, and the gallery. Drag images to reorder them, add a caption where it helps, remove the ones you no longer want.
Images are resized and compressed automatically on upload, so you can drop in large files without thinking about it. Every change is saved and the site updates itself within a minute.
If the panel is empty or fails to open, the site carries on regardless: it shows placeholders instead of the photographs and nothing else changes.