How much later had you planned on?
I just noticed those are still broken. I also determined the probable cause. Looks like the website is hosted on a case-sensitive file-system. All the images in the zip (and seemingly on the website) are lower-case extensions, but the examples here, and a few more I found via grep on the downloaded archive, have .PNG instead of .png. To ensure the docs work fine on Linux, the website, and any other case-sensitive systems, the .PNG references need to be changed to .png. I can fix that myself, but does anyone still have access handy to update the archive and the website with the changes?
Also I noticed that Texture Replacement doesn't get covered in the Ships Editor section. I guess it seems pretty trivial but it does seem incomplete without a line or two of explanation and caveats, and maybe a screenshot. Had a user on Discord earlier asking about how to use it and I couldn't even find any documentation for him to confirm he was doing things correctly.
Edit: Finished fixing the .PNG references, they were all contained within one file, "fullwalkthrough.html". Uploaded a fixed archive to http://swc.fs2downloads.com/files/Diaspora_Docs.7z
, could replace the one on the site currently with that and extract the fullwalkthrough.html from it and replace the existing one on the website.