Fx Text link CTAs should use the Metropolis Font

[dzingeek]

All Firefox text link CTAs should use the Metroplis font.

See screenshot for reference

[stephaniehobson]

@dzingeek And buttons too, right?

[dzingeek]

yes and buttons too. we will add another github issue for buttons we just haven't done it yet. but that issue will have more than just the font outlined.