There should be a slimbox images between the h1 "Images" and "Click each image..." I've double checked my files and... everything seems to be in the right place.
I just can't figure this out.
I think the links of the list items should be updated as follows
<a href="path of the larger image of 1_outside_final_cropped.png" rel="lightbox"><img src="1_outside_final_cropped.png"></a>
But if you want to add the external HTML as the resource file. you need to use the light box plugin. Please the action in the following URL