Design: Revisit/rebalance typography, once site is fully redesigned

[urcades]

During our last design review for urbit.org, a number of critiques on the current typographic direction were made:

• Scaling of footer typography w/ respect to the overall sizing of the footer needs some balancing
• Sizing is huge -> I think h1 should be h2 and so forth.
• The typography of a blog post doesn’t feel as good as it used to

It would be good to revisit some of these critiques once we've fully built out all of the requires pages such that we have parity with the old urbit.org site, this way, typographic changes can be assessed against the entirety of the site's content.