At the end of the last post, I made a little footnote marking a little issue I had with the site serving mixed content. It turns out, a setting I had put in place on the GitHub pages site itself resolved it, but just took some time to do so. I had set the Enforce HTTPs setting to checked on the site, saw no change, then began writing the previous post. I guess it just took a few minutes to take effect because as soon as I pushed the new post, viewing the site was now showing as fully locked down as I would have expected. Nothing popping up in the console about mixed media, just plain old secure connections.
Nothing like good old-fashioned https
Great success!