improve layout, nav; add sign out on user page

src/routes/auth/+page.server.ts

@@ -0,0 +1,14 @@
+import { fail, redirect } from "@sveltejs/kit";
+import { invalidateSession, deleteSessionTokenCookie } from "$lib/server/auth";
+import type { Actions } from "./$types";
+
+export const actions: Actions = {
+	logout: async (event) => {
+		if (event.locals.session === null) {
+			return fail(401);
+		}
+		await invalidateSession(event.locals.session.id);
+		deleteSessionTokenCookie(event);
+		return redirect(302, "/");
+	}
+};