No documentation/releases for standalone version

**Is your feature request related to a problem? Please describe.**
We use babel-minify in a browser, and previously depended on babel-standalone to provide babili.min.js. The last available release is here, now well out of date: https://github.com/babel/babel-standalone/releases
This version has bugs that are blocking us so we need to update, but I can't find any equivalent to get a standalone version of babel-minify that is up-to-date. I can't even find any documentation on how we could build an equivalent ourselves.

**Describe the solution you'd like**
Ideally standalone releases of babel-minify as there used to be for babili, but failing that, at least some documentation on how to build or get a standalone version.