Move templating and creation of dropdown menu to front-end

[caseycesari]

• Refers to this menu

• Code: https://github.com/CoastalResilienceNetwork/GeositeFramework/blob/128f17cb97401d41ee359f33cb06ae99b6804161/src/GeositeFramework/Views/Home/Index.cshtml#L5-L66

Depends on #1086