11803 headings

Test steps:

- pull topic branch
- re-install site
- Ensure that headings (h1,h2,h3) are in the correct order on /publications, /news-media/news, /news-media/news-archive, /news-media/media-releases, /news-media/events
- Ensure that h2 headings styling on the following pages match those on dev (should be 14px bold grey) for the above pages.