chore: rename "Misskey Games" to "Games"

This should fix the alignment issue in the menu due to the length and also fits better for it's future purpose.

packages/frontend/src/navbar.ts

@@ -119,7 +119,7 @@ export const navbarItemDef = reactive({
 		to: '/my/achievements',
 	},
 	games: {
-		title: 'Misskey Games',
+		title: 'Games',
 		icon: 'ph-game-controller ph-bold ph-lg',
 		to: '/games',
 	},

packages/frontend/src/pages/games.vue

@@ -28,7 +28,7 @@ import { i18n } from '@/i18n.js';
 import { definePageMetadata } from '@/scripts/page-metadata.js';
 
 definePageMetadata({
-	title: 'Misskey Games',
+	title: 'Games',
 	icon: 'ph-game-controller ph-bold ph-lg',
 });
 </script>