I think there was a RES feature on Reddit that made it so you could click a button on the top of the page and all the images would be expanded. Maybe something like that if it also had a text feature that showed the first chunk of text on posts as well? Then it could also be a user setting, and people could have it either way.
Also wanted to add, I feel very odd offering any suggestions at all because I can't imagine the work that went into constructing this website so quickly. I'm immensely grateful, and love it here already
It's not quite what you're looking for, but if you spot a little icon under the post title, to the left of the time posted, clicking it will expand the post content downwards. I've found it on text posts and image posts that aren't a link off-site.
Thank you, I had no idea!