Implements the Yoast sidebar for Gutenberg: added the Readability, Focus Keyword and Cornerstone content tabs to the sidebar.
Revamps the Yoast metabox to use the same vertical design as the new sidebar.
Implements the same tabbed layout in the plugin's network settings screen that is also used in the plugin's site settings screens.
Implements a plugin-specific network settings API and use it in the network settings screen.
Introduces a network admin-specific admin bar menu.
Adds notifications to the Notification Center in regards to Gutenberg compatibility. If Gutenberg is older than the minimum supported version by Yoast SEO, a 'problem' notification is added. If Gutenberg is only slightly outdated, a 'normal' notification is added.
Implements the automatic detection of the keyword for terms based on the term's title.