Add Void difficulty and publish changelogs

app/about/page.tsx

@@ -33,7 +33,7 @@ export default async function About() {
         <h2>{t("Five chances to find your way")}</h2>
         <p>
           {t(
-            "Easy gives you 180 seconds, Normal 90, and Hard 30. Hard disables zoom. A timed-out round scores zero; you can still finish the expedition.",
+            "Easy gives you 180 seconds, Normal 90, and Hard 30. Void is the hardest: just 10 seconds, a fixed panorama and map, no zoom, no compass or coordinates, and strict scoring. A timed-out round scores zero; you can still finish the expedition.",
           )}
         </p>
         <h2>{t("Closer means better")}</h2>