Release doesn't work with wasm-pack and Rust out of the box

[faassen]

🐛 Bug Description

The latest release, Twiggy 0.7.0 is from August 2021. In order to make Twiggy work with wasm-pack I needed to switch to the version from github, as otherwise I could get a "Unknown opcode" error. (perhaps related to #577 though that is from before the release).

See also #742 - critical documentation on how to make it work with wasm-pack seems to missing; this would be good to have in the documentation.

So a release would be useful so that others don't run into the same problem.