Summary:
Ref PHI1275. Previously, see T591. See also T7963. Headers are currently very visually similar to one another, and similar to the text size:
{F6485441}
I think the design intent was to make it hard to make bad-looking documents, but all the headers end up being very samey.
Differentiate the sizes of the headers better so they're much more obvious (e.g., when scrolling through a document) and the different levels are more distinct.
This might be a little overboard, but we can always pull it back a bit if it's too much, and I think giving users more control in Remarkup (in cases where it doesn't create some weird syntax/parsing nightmare) is generally a good thing.
Test Plan: {F6485447}
Reviewers: amckinley
Reviewed By: amckinley
Differential Revision: https://secure.phabricator.com/D20569
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