Removed arbitrary page reset hook.
Check for global  variable in page layouts to avoid unecessary configuration when there is no valid query.
Removed responsive viewport from theme support as it should be included in themes instead.
Added default thumbnail fallbacks.
Added ACF support to create default page layouts and page-specific layouts.
Made initial page layout settings specific per page ID established by the main query.
Use WordPress embed and video shortcodes to output page section video backgrounds.
Updated README.