www: update README to remove wasm-pack; use cargo web start

wasm-pack is more broken, see #171 (comment)
cargo web start is still broken (#171) but less so

Author: iceiix

www/README.md

@@ -7,15 +7,7 @@ for progress see: [https://github.com/iceiix/stevenarella/issues/171](https://gi
 
 ## Building
 
-To build for wasm32-unknown-unknown, run in the top-level directory (not www):
-
-```sh
-rustup target add wasm32-unknown-unknown
-cargo install wasm-bindgen-cli
-wasm-pack build
-```
-
-or:
+To build for wasm32-unknown-unknown, run:
 
 ```sh
 cargo web start --target wasm32-unknown-unknown
@@ -38,7 +30,7 @@ open http://localhost:8080/
 
 ## Credits
 
-Based on `[rustwasm/create-wasm-app](https://github.com/rustwasm/create-wasm-app)`:
+Based on [rustwasm/create-wasm-app](https://github.com/rustwasm/create-wasm-app):
 
 > An `npm init` template for kick starting a project that uses NPM packages
 > containing Rust-generated WebAssembly and bundles them with Webpack.