DEV-1095: Outage notifications

[carylwyatt]

Finishing up DEV-1095 with a few additions to the original outage notifications:

• add message-only variant
• add "brand" style variant
• hook the alerts up to external json data
• fix accessibility issues
• add stories to storybook
• update README with instructions for alert json data

external data

The biggest hurdle for this update was the external json data. A challenge I ran into was making sure this component could reach the data, whether the component is at www, catalog, or babel. Aaron helped me find the best place and way to reach the data, which will be at /common/firebird/alerts/alert.json. This will work across all applications (e.g. https://dev-3.babel.hathitrust.org/common/firebird/alerts/alert.json, but also https://dev-3.catalog.hathitrust.org/common/firebird/alerts/alert.json and https://dev-3.www.hathitrust.org/common/firebird/alerts/alert.json)

to test

Go to dev-3 and see the test alert! Updating or removing the alert will require manually writing a file to the server, so that part is on me, but the current alert should be visible across all the domains:

• https://dev-3.www.hathitrust.org/
• https://dev-3.catalog.hathitrust.org/Search/Home
• https://dev-3.babel.hathitrust.org/cgi/ls
• https://dev-3.babel.hathitrust.org/cgi/pt?id=1

[liseli]

I have tested and it is working fine. I have done some searches and the alert is always present. I guess that is the expected behavior.