Design: create page-specific banners for manage.get.gov

[vickyszuchin]

Issue description

If the registrar is unavailable, we should inform users on manage.get.gov. A banner to communicate the situation on affected pages will be helpful. Currently, we do not have a page-specific banners for manage.get.gov. We should create page-specific banners that to communicate any production issues (for errors and down for maintenance ) that may result in registrar being unavailable.

Acceptance criteria

• Determine the pages that need a page-specific banner
• Define sample content for boilerplate page-specific banner for re-use (eg., date/time placeholder, create one for maintenance, degraded performance, outage, etc.)
• Create dev ticket for implementation, if needed

Additional context

No response

Links to other issues

Related to:

• Design banner to inform users/analysts when the registrar (manage.get.gov) is unavailable get.gov#226
• Django Admin: Banner (or other notification) when the registry is down #1165
• Create site-wide banner for manage.get.gov  #2494