why this particular page even exists in the first place
A quirk of how Neocities is set up forbids access to directories in a site that are just folders. In theory you'd be able to see the files within that folder (Try navigating to a directory on your computer in your browser, you should get a file explorer page showing what's there. The URL will begin with "file:///" but otherwise look as it would in your normal file explorer.), but that info is meant to be private (the site's creator chooses what files are visible to the public or not), ergo the average viewer isn't allowed to see it. Ergo, 403 Forbidden.
But, if I make an HTML file with the same name as the folder and in the same directory, then removing part of the URL (i.e. https://delta7447.neocities.org/about/contact becoming https://delta7447.neocities.org/about) would take you to a sort of root page, rather than an unhelpful error.
However, if you add a slash to the URL--for example https://delta7447.neocities.org/about/--then you'll still get the 403.
I'd love to make a custom 403 Forbidden error like my 404 page, but Neocities doesn't allow custom .htaccess files, which is how I'd theoretically point my site to show that page in the event of a 403 error.
