docs: Precompiled, packaged & minified version

This PR updates the playground build to be precompiled (hsp, and js
transpiled) packaged and minified.

The goal is to optimize the initial display of the playground.
`noder.execute` returns the exports object, so it shoud be sufficient to do:
```js
noder.execute(code, moduleName).then(function (sampleExports) {
   var spl = self.data.samples[self.data.sampleIndex];
   spl.sample = sampleExports;
   // ...
}, /* ... */).end();
```