But there is an old-school README.me at the github homepage: https://github.com/stanford-scs/jai The repository has an old-school ASCII INSTALL file.

If you don't like the vitepress site, just use github and read the human-written README and man page there. All the information you need to use the software is available without laying eyes on any AI slop. Of cource, if you hate AI so much that you can't get past a vibe-coded landing page, you might not be the target audience for jai, because you probably aren't doing a lot of vibe coding. But maybe jai is still useful to you for grading programming assignments or running installer scripts.