feat: Site status message

[holloway]

Features

• show a status message on all public pages
• doesn't require JavaScript
  • non-JS browsers uses an iframe pointing to a route showing the latest status message. If no site message is active it shows "No site status message.". The iframe is a <noscript><iframe src=></iframe></noscript>.
  • JS browsers use Vue NaiveUI Notifications with default design. Dismissed statuses are noted in browser localStorage (ie per device and browser) not per user, so dismissed statuses aren't remembered on a different device and will need to be dismissed again.
• doesn't pollute Cloudflare cache with status messages (ie status messages can't be inline in the template, the browser has to compose the page)
• Has an endpoint to redirect users to the latest status /status