ui: move logout into the hamburger menu too

static/app.js

@@ -227,7 +227,7 @@ function showPlayOverlay(v) {
     const me = await api("/api/me");
     document.getElementById("me").textContent = "hi, " + me.user;
     const lo = document.getElementById("logout");
-    lo.style.display = ""; lo.onclick = async () => {
+    lo.onclick = async () => {
       await fetch(BASE + "logout", {method: "POST"}); location.href = BASE + "login";
     };
     const mb = document.getElementById("menubox");