Display page of copy about a topical event on public site
Make topical event about pages searchable
Render Markdown for about page body in admin UI
Select Topics in main nav when on About page
Improve readability by extracting logic to named method
Fix page title tests, excluding admin/about_pages/(edit|new)

To force this test to pass would introduce duplication; better to skip
the test in this case.
Add cucumber scenario to test about pages
Vertically align baseline of 'Contents' and page heading