build: add kludges to build for WASI

[srenatus]

Build with

GOOS=wasip1 GOARCH=wasm go build -o regal.wasm .

Run with wasmtime regal.wasm and the like:

$ curl https://wasmtime.dev/install.sh -sSf | bash
# ...
$ wasmtime --version
wasmtime-cli 13.0.0
$ wasmtime --dir $(pwd) regal -- lint bundle
90 files linted. No violations found.

❓ I didn't get this to work on webassembly.sh 🤷

[anderseknert]

Awesome! Could you add the "docs" from the PR description to some "Wasm (Experimental)" section in the development.md docs?