I have a bad history with finding Adobe documentation. I know they have docs, I just can’t seem to enter the correct search terms to find what I need.
I was looking for documentation on how to implement your own web template in Adobe Photoshop lightroom, and it turns out the key term for this is “webengine”.
… I guess that makes sense. At any rate, if you are looking to implement a plugin in Lightroom that generates a customized web gallery, you need the Lightroom SDK Documentation.