You finally find it. The holy grail of documentation—hosted right on a GitHub repo’s wiki. No ads, no paywalls, just clean Markdown. You bookmark it, maybe even clone it.

Then one day: 404.

A GitHub wiki is not a set-it-and-forget-it knowledge base. It’s a Git repo with an attractive UI wrapper—and like any repo, it can be nuked, poisoned, or kidnapped.