Add a menu to create and manage entities

[rbento1096]

Copy logic from old React app
Also, change entity managing/creation permission in front and back-end from isAdmin to canManageContent

Migrate the equivalent page from the previous app (found on the react-old branch) to Angular.

Add both the list page (i.e. Venues Page) as well as the Individual page (i.e. Venue Page) and any extra components used by it on the old version if they haven't been added yet.

TIP: try using ChatGPT to translate the code from React to Angular -> it won't be perfect but it's a good starting base