Completely remove the other image gallery themes.
I now have: image galleries, with lightboxes, and captions, with links
in them (and to Hugo pages), with full images lazy-loaded, with all
thumbnails auto-generated, and the ability to do this on both
individual images *and* with globbing, from page resources, from this
page or any specified one. See cavelab_notes.txt.
It also has the ability to use Exif data of the photo - if I
preprocess it into a JSON file.
Known issues:
- The theme header/footer are now being overridden. I am working to
fix this first.
- I am missing some kind of fonts/images needed for the lightbox to
show up properly.
