fix(site): link to the game with target=_self to avoid VitePress SPA 404

VitePress is a Vue SPA; a same-origin link to /game/ (a separate app, not
a VitePress page) was intercepted by its client router and rendered
VitePress's own 404 until a manual reload. Mark the game links (both
home pages and the nav item) target="_self" so the click is a real
browser navigation that the edge Caddy serves from the game bundle.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

site/.vitepress/config.ts

@@ -28,7 +28,11 @@ export default defineConfig({
       label: "English",
       lang: "en",
       themeConfig: {
-        nav: [{ text: "Play", link: "/game/" }],
+        // The game is a separate app under /game/, not a VitePress page.
+        // target "_self" makes the link a real navigation (full load),
+        // not a client-side SPA route — otherwise VitePress shows its
+        // own 404 for the unknown route.
+        nav: [{ text: "Play", link: "/game/", target: "_self" }],
         sidebar: [
           {
             text: "Galaxy",
@@ -42,7 +46,7 @@ export default defineConfig({
       lang: "ru",
       link: "/ru/",
       themeConfig: {
-        nav: [{ text: "Играть", link: "/game/" }],
+        nav: [{ text: "Играть", link: "/game/", target: "_self" }],
         sidebar: [
           {
             text: "Galaxy",

site/index.md

@@ -2,4 +2,4 @@
 
 A turn-based space strategy game.
 
-[Play the game →](/game/)
+[Play the game →](/game/){target="_self"}

site/ru/index.md

@@ -2,4 +2,4 @@
 
 Пошаговая космическая стратегия.
 
-[Играть →](/game/)
+[Играть →](/game/){target="_self"}