Version 3.1.3 - Pre-release

What's Changed

• Fix: secondary nav z-index, main edu nav styles by @stephiescastle in #508
• chore: integrating all page templates from www-frontend by @stephiescastle in #510
• chore: bumping to version 3.1.3 by @stephiescastle in #511

Full Changelog: 3.1.2...3.1.3