fix: move environment files to config directory

[TheLarkInn]

Move environment configuration files from environments directory to config directory. Also bumped webpack beta to .20 (chore).

This allows for free movement of app [or using multiple apps] without affecting/needing to change environment paths imports/exports.
Fixes #1603

[tapas4java]

Why this change??
Are we fixing any particular issue by removing environment directory?

[TheLarkInn]

We are not removing it, but simply moving it from an environments folder to an app folder like the above comments mention. This fixes #1603

[tapas4java]

@TheLarkInn Thanks, I was asking why we are moving 3 environment files to app directory. I thought it was good inside environment directory as user can add few more environments later.

From #1603 it looks like this change is required for NgModule support which should be fine.

[TheLarkInn]

Yup! This is a 'looking-forward' change for ngmodules.

[filipesilva]

Closed in favor of #1633.

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