This file exists, all right. In fact, I wrote it for the world to see. If you've installed keybase you can see the actual contents of this file (it's nothing Earth-shattering, I swear; just some basic CommonMark that I really need to go back and clean up to retain any self-respect) at
And YES, it works. When I edit index.md on my own computer, these sites all instantly update:
If you're testing the Keybase filesystem, this will all work for you, too.
keybase.pub is just a dumb site that serves any plain text files that contain Markdown straight out of
/keybase/public as web browser-compatible HTML.
Peter J. Mello, 2016–2021.