Image gallery integration into web-page

There are several different options out there. If you want to utilize the gallery app then you can utilize Magnific Popup https://dimsemenov.com/plugins/magnific-popup/ . I've used it several times in different websites, but you will have to integrate it into the Gallery App templates. Magnific Popup is getting a little bit long in the tooth but still works for me. Here is another Gallery option as well http://unitegallery.net/index.php . I haven't personally used it, but I'm considering it for a project I just started. I believe both gallery options I gave you are jQuery based so that is something you will have to consider.

I think a better solution for a gallery might be to create a template that has images in a list format and then add a lightbox around each image. Just use the lightbox2 script https://lokeshdhakar.com/projects/lightbox2/.