improve layout, nav; add sign out on user page

src/routes/+layout.server.ts

@@ -0,0 +1,9 @@
+import type { LayoutServerLoad } from "./$types";
+
+export const load: LayoutServerLoad = async (event) => {
+	const { user } = event.locals;
+
+	return {
+		user
+	};
+};