A11Y: Add heading role for post titles. (#13143)
Not all screen readers treat articles as navigable roles when moving between landmarks. To help with this, we use a
heading role on the title, with an arbitrary depth of 2 chosen as to not conflict with the main
<h1/>. Because ARIA roles are used, this change should be entirely non-visual.
While this introduces minor navigation challenges in posts where headers are included, the vast majority of posts don’t, and as screen reader users, we’re used to mixed headers in longer-form content.
GitHub sha: 549e100d