docs: add story about autoprefixer config

[markgoho]

Those wishing to change which browsers are targeted for when css is prefixed can do so with a simple addition to their package.json file

[clydin]

I think the browserslist file may be a cleaner option than the package.json field; especially in regards to overall project readability/discoverability, and more generally, separation of concerns.

[filipesilva]

Heya, your PR looks good. Thanks for adding this!

Can you also add a link to this guide to the stories list please?
https://github.com/angular/angular-cli/blob/master/docs/documentation/stories.md

[filipesilva]

I also agree with @clydin that using the file is better than changing package.json.

[markgoho]

@filipesilva I added the link in PR#6188

[filipesilva]

Ok, I see the link in that new PR. Can you also mention the two ways of setting it please? Package.json and the browserlist file.

[markgoho]

Changes made -- added the additional option to create a config file.

[filipesilva]

LGTM @markgoho, thanks! CI is failing because of the second commit message, it doesn't fit the required format. If you have time I'd appreciate if you could squash the commits, otherwise I'll do it myself when I merge some other PRs.

[markgoho]

I'm sorry @filipesilva -- I have no clue how to do that. I've done these PRs directly from github.com and I think squashing has to be done from the command line.

[filipesilva]

No worries, I'll sort it. 👍

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