Make button styles consistent

[jkup]

This awesome screenshot from @bsclifton shows inconsistencies in our primary and white buttons. We should make them all look identical re: font-size, color and font-weight.

[luixxiul]

#5705 should fix some of them.

[jkup]

It actually looks like these discrepancies are intentional. If you inspect those bold buttons or the white one with orange text you'll see custom classes like secondaryAltButton are responsible.

@bradleyrichter is it desired to have some buttons (import browser data for example) with bold white text and some white buttons with orange text or should they all look 100% consistent?

[bradleyrichter]

@jkup They should all match this pair:

Here is are the specs for the button styles:

[jkup]

@bradleyrichter Ok awesome! I'm going to remove all these additional classes so they all look the same!

[bradleyrichter]

Awesome. And then I can refine them like a boss. (soften up the shadows and blends)

[luixxiul]

Test plan: #5916 (comment)