message: docs: use `wasm-pack build` instead of `wasm-pack init`
  The latter has been deprecated for some time.
diff: # pack and publish
  The `publish` and `pack` commands interact with the pkg directory that's
  -created when you run `wasm-pack init`. The `pack` command creates a tarball
  +created when you run `wasm-pack build`. The `pack` command creates a tarball
  from the pkg directory and the `publish` command creates a tarball from the
  pkg directory __and__ publishes it to the NPM registry.
  