fix(@angular/cli): flatten index.html config during output

[intellix]

We're attempting to re-use common library code within the same CLI codebase. To achieve this we're putting apps in separate folders like:

/coca-cola
    /app
        app.module.ts
    styles.scss
    index.html
/pepsi
    /app
        app.module.ts
    styles.scss
    index.html
/shared
    /components
    /services

index.html has it's own brand specific things, like a unique <title> for instance. This means we need to separate them and point to them using appConfig like:

"index": "coca-cola/index.html",

When you run an ng build though, the index.html is still inside the branded folder, referencing JS that is up a directory. This PR flattens the appConfig.index property, as it should always be in the root directory with the JS files anyway

Fixes: #7309

[grizzm0]

The use in #7309 is wrong as both outDir and index contains the path "dm". Put them together and you get outDir + index = dist/dm/dm/index.html.

See my post here (#7124 (comment)) about how to have multiple apps with shared code. It works just fine. You need to edit outDir and root. Not outDir and index.

[intellix]

Closing as it's probably irrelevant by now and eases PR maintenance burden :)

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