`btn-link` is not usuable with our CSS

We've rewritten the .btn class in a way that makes it impossible to use the .btn-link class and still get the same UI as bootstrsap.

This is what we should see if we use btn btn-link:

Screen_Shot_2018-04-16_at_16.27.59

This is what we see in gitlab if we use btn btn-link Screen_Shot_2018-04-16_at_16.31.06

When used only with btn-link it does render the expected UI BUT only in an active button. A disabled button, when hovered will render a white color text

cc @timzallmann @ClemMakesApps

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