Atomic Feature: Display an informative notice when site is disconnected and no longer available in Calypso.

What When WordPress.com on Atomic sites are completely disconnected from Jetpack, the user generally sees no notice. Instead, a user is presented with a notice that they have no WordPress.com sites with no indication of next steps.

Why To reduce user panic and provide clear next steps for resolving issues.

How Provide a notice to contact support when a Jetpack connection issue is detected for an active WordPress.com on Atomic site.

Perhaps a fixer that can fix the connection for them.