I would love one of you're still offering

Of course, it's just a http server. All you have to do is port-forward.

If they're well named files, just spin up a webDAV server via rclone and search by file name in the browser. You could also use davfs2 to mount the server locally in a directory and then filter through the content with fd | fzf

If they're text files, spin up a docker with Forgejo (formerly gitea) and enable the bleve search indexer.

If you wanted to get really fancy, you could have wikijs in the same docker container, use git as a backend and get a wiki that's easy to fork and distribute among the team.