Update type styles to latest design standards

[dechov]

See @LevinMedia's note on type styles in #418 (comment), in the context of the dispute details screen but applicable in a general way across this app as well as upstream components:

If you could, please align them to the type scale described in the Figma file.

The card headers use Title S with $studio-gray-80 color

The card bodies use Body with $studio-gray-60 as the color

The bold text that separates paragraphs in the second card are also body but bold, and using $studio-gray-80 as the color

per our slack chat - hopefully type scale linked above will soon be included with gutenberg, until that time we can hard code it.

If too much time passes though, we'll probably want to include the type scale as part of @woocommerce/components - as we're using it elsewhere in new designs across WooCommerce such as onboarding and other new screens in wc-admin.

[LevinMedia]

No longer relevant - closing