app: Add a component to delete a user

Also adds a way to hook to the bootstrap modals to show or hide them.

app/src/components/mod.rs

@@ -2,6 +2,7 @@ pub mod add_user_to_group;
 pub mod app;
 pub mod change_password;
 pub mod create_user;
+pub mod delete_user;
 pub mod login;
 pub mod logout;
 pub mod remove_user_from_group;