export the typography api

[e-cloud]

Bug, feature request, or proposal:

feature request

What is the expected behavior?

user can use the typography scss api

What is the current behavior?

No scss api exported, at least not exported at latest master by now

What are the steps to reproduce?

no

What is the use-case or motivation for changing an existing behavior?

control the typograhpy

related: #205 #4162

[jelbourn]

Typography is in-progress.

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