Changelog:
- Added featured box titles link functionality
- Added compatibility styling for Jetpack Portfolio titles sizes in widgets
- Improved scroll-to-anchor functionality
- Improved accessibility for landing page block icons, boxes links and titles, edit button, read more links and back-to-top button
- Improved first content title spacing before
- Improved landing page icon blocks and text areas disabling condition checks
- Fixed site title border visible and taking up space when site title is hidden
- Fixed cover+fixed background images zoomed incorrectly on Safari
- Fixed cover+fixed background images shaky on IEs and Edge
- Disabled global post nav under 640px screen width
