consider splitting NPM package into a separate repo #60

This repo contains both the Rust package and the NPM package. To accomplish this, we are swimming against the tide quite heavily:

• hack about separate READMEs for NPM, the GitHub page and Rust: restructure README's #36
• hack about having separate versions for each: NPM version: add explicit version configuration #57
• we would add prefixes to the version tags going foward (rust-x.y.z etc).

Now that we have all of this we could roll with it, but by now I got the feeling that we should have just done it in separate repos, where the NPM repo just includes the Rust package as a dependency. Then all the above workarounds become unnecessary.

The workarounds above incurs a mental overhead to anyone looking at this repo - separate repos would be straight forward to understand and work with.

Potential downside: development of new features could be a bit more difficult as one would have to use a dev-version of the Rust package in the NPM repo to develop a feature in both repos at once.