Update MineGeo domain and harden process supervision

desktop/main.cjs

@@ -154,7 +154,7 @@ function createWindow() {
                 title: "MineGeo",
                 message: `MineGeo Desktop ${app.getVersion()}`,
                 detail:
-                  "Play at minegeo.vercel.app. Requires an internet connection.",
+                  "Play at minegeo.site. Requires an internet connection.",
               }),
           },
         ],

desktop/navigation.cjs

@@ -1,4 +1,4 @@
-const SITE_URL = "https://minegeo.vercel.app";
+const SITE_URL = "https://minegeo.site";
 function isInternal(value) {
   try {
     return new URL(value).origin === SITE_URL;