Building all public files to www folder

I am trying to setup an app, but I am not really happy with the project structure. I use aurelia-cli to build app. My which is to have all files like ts, less, in `src` folder, and after build move it to `www` so that this folder becomes app web root and contains only website files. My root of the project might have so many other configuration files, so I do not want to have that mess in the project root.

I have been able to configure everything as I want and only one thing is not working. First let me say what I did in `aurelia.json`

```
"platform": {
"port": 9000,
"index": "index.html",
"baseDir": "www",
"output": "www/scripts"
},
"build": {
"targets": [
{
"port": 9000,
"index": "index.html",
"baseDir": "www",
"output": "www/scripts"
}
],
```

this is places where ш added `www`. Output for build process mode bundles to www folder. baseDir so that web server on `au run --watch` starts in the www folder as root.

But I have problem that `vendor-bundle.js` at the end generate

```
function _aureliaConfigureModuleLoader(){window.define=SystemJS.amdDefine; window.require=window.requirejs=SystemJS.amdRequire; SystemJS.config({
"map": {
"text": "text",
"app-bundle": "www/scripts/app-bundle.js"
},
"bundles": {
"app-bundle": [
"app",
"app.html!text",
"ext/home/home",
"ext/home/index",
"ext/home/tmpl/home.html!text",
"ext/home/tmpl/index.html!text",
"main",
"unknow",
"unknow.html!text",
]
}
});
```

You can see that it adds `www/` to `app-bundle.js` directory. So that when it is loaded, it cannot load app-bundle. If I fix it by hand, everything works until the new update of vendor-bundle file.

And there is not way to fix it from configuration as I can see. If I delete www in `aurelia.json` then is generates scripts in the other folder, not inside www, if ш keep it, it adds www to that path.

I think that `baseDir` has to be deleted from the path to file. So fix have to be applied in aurelia-cli. I tried to find it and make PR, but I could not find, it is too complicated for me.

Reproduce the build with the shown aurelia.json platform and build targets, keeping baseDir and output set to www and www/scripts. Trace aurelia-cli's vendor-bundle generation and inspect the generated vendor-bundle.js; done means app-bundle.js is referenced without the www/ prefix while the bundle still belongs under www/scripts and loads correctly.

Written by the indexing model from the issue text.