Enable "administrator" features for Library Search

[eporter23]

Is your feature request related to new functionality not yet included in the product? Please describe.
A clear and concise description of what the new feature will provide.

Enable user management roles so that administrators can perform functions in the application such as enabling a banner message on the homepage, or enabling experimental features for testing.

Is your feature request related to a problem or a change to existing functionality? Please describe.
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When we have maintenance or service disruption, a product manager cannot add alert messages to the homepage without software engineering assistance.

Describe the solution you'd like
A clear and concise description of what you want to happen.

• Enable an administrator role
• Add selected staff to this role
• Provide a user interface allowing editing of the alert banner on the homepage
• Provide a user interface allowing certain product features to be toggled on or off

Describe alternatives you've considered
A clear and concise description of any alternative solutions or workarounds you've considered.

How will this impact users?
A clear and concise description of how many and which types of users would benefit from this feature, or any who may be negatively impacted by the change.

• Product managers can provide system updates more quickly in a self service capacity
• Product users can get alerted more quickly when maintenance or a related service outage occurs

Additional context
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