Move auth and timezone hooks into dedicated hook files

frontend/src/layouts/MainLayout.tsx

@@ -30,7 +30,7 @@ import {
   NavigationRegular,
 } from "@fluentui/react-icons";
 import { NavLink, Outlet, useNavigate } from "react-router-dom";
-import { useAuth } from "../providers/AuthProvider";
+import { useAuth } from "../hooks/useAuth";
 import { useServerStatus } from "../hooks/useServerStatus";
 import { useBlocklistStatus } from "../hooks/useBlocklist";