Changelog:
- Removed content background colour from landing page slider area
- Changed content left/right from 1em to 2em for better responsiveness and boxed layouts
- Adjusted elements content background colour applies to and replaced its usage on some other elements with site background colour
- Clarified landing page activation requirements in the customize panel
- Improved header video support and fixed header height on non-homepage sections
- Further improved sidebar and colophon responsiveness
- Updated to Cryout Framework 0.6.5+
