docs: add viteconf 2025 video playlist (vitejs#2190)

Author: jay-es

.vitepress/theme/components/AsideSponsors.vue

@@ -21,7 +21,7 @@ const sponsors = computed(() => {
 <template>
   <a
       class="viteconf"
-      href="https://viteconf.org/?utm=vite-sidebar"
+      href="https://www.youtube.com/playlist?list=PLqGQbXn_GDmkJaoykvHCUmXUPjhgH2bVr"
       target="_blank"
   >
     <img
@@ -33,7 +33,7 @@ const sponsors = computed(() => {
     <span>
       <p class="extra-info">Building Together</p>
       <p class="heading">ViteConf 2025</p>
-      <p class="extra-info">初めて対面で開催！</p>
+      <p class="extra-info">リプレイを視聴する</p>
     </span>
   </a>
   <VPDocAsideSponsors v-if="data" :data="sponsors" />

.vitepress/theme/components/landing/1. hero-section/HeroSection.vue

@@ -7,7 +7,7 @@ import HeroDiagram from './HeroDiagram.vue'
     <div class="container">
       <!-- ViteConf 2025 Button -->
       <a
-          href="https://viteconf.org/?utm=vite"
+          href="https://www.youtube.com/playlist?list=PLqGQbXn_GDmkJaoykvHCUmXUPjhgH2bVr"
           class="hero__pill"
           target="_blank"
       >
@@ -17,7 +17,7 @@ import HeroDiagram from './HeroDiagram.vue'
           width="20"
           height="20"
         />
-        <span>ViteConf 2025</span>
+        <span>ViteConf 2025 Replay</span>
       </a>
 
       <!-- Heading -->