Document using SASS_PATH to enable absolute path imports

[iansu]

There are a couple of issues where this appears to be the solution. See: #4494 (comment) and #5599 (comment)

We should add this to the Sass docs: https://facebook.github.io/create-react-app/docs/adding-a-sass-stylesheet

[iansu]

@jayantbh Would you like to work on this since you're the one who reported the fix?

[jayantbh]

@iansu sure! Will do!

[jayantbh]

Here's the PR I submitted: #5917

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