Add language color css
Flesh out v1.0 sidebar
Create system alerts
Add migration for hibernation alerts.

This creates a copy of the existing hibernation notifications, but does
not yet expose them in the interface.

The additional field `alert_id` on notification allows the migration to
be run multiple times without creating duplicate alerts.
Regenerate js/css
Delete support for custom notifications
Delete old, read alerts in notification cleanup task
Create hibernation alert

Stop creating notifications with type 'hibernation'.
Display hibernation alerts
Add task to delete hibernation notifications
Delete data migration task
Delete temporary column from Notification

This was in support of a data migration that has been run in production.
Delete hibernation/notification migration task
Add migrations for eventually ditching STI.
Delete notification experiment
Clarify API alerts/notifications
daily email message. sends user unread notifications and some pending submissions that need nitpicks
Rename Daily -> Notification message. Make email multipart (html/plain text). Only send email if user has notifications