feat(seo): improve SEO and add analytics tracking

This commit introduces several enhancements for SEO and analytics.

- Updates the canonical site URL from `yphsalumni.com` to `yphsalumni.org`.
- Enriches the 'middle-highschool-tuition-class' page with detailed Open Graph (og) meta tags for better social sharing.
- Implements Umami event tracking for the 'Join Us' button on the homepage.

app/pages/about/middle-highschool-tuition-class.vue

@@ -79,8 +79,16 @@
 
 <script lang="ts" setup>
 useSeoMeta({
-  title: "致中补班的一封信",
+  title: "致：1956年永中中补班 — 永平中学校友会",
   ogTitle: "致中补班的一封信",
+  ogDescription:
+    "致亲爱的1956年‘诚’、‘毅’两班老校友：虽迟六十余年，愿这条讯息穿越时间，召集大家重聚，共叙曾经校园情怀与夕阳红岁月。",
+  ogUrl: "https://yphsalumni.org/about/middle-highschool-tuition-class/",
+  ogType: "article",
+  ogImage: "/about/中补班乙.jpg",
+  ogImageAlt: "永平学校中辅乙同学合影",
+  articlePublishedTime: "2022-04-15T00:00:00+08:00",
+  author: "永平中学校友会",
 });
 
 const imagePopup = ref<boolean>(false);

app/pages/index.vue

@@ -39,6 +39,7 @@ const heroCta = ref([
     label: "立即加入我们",
     to: "/join-us",
     icon: "mdi:account-plus",
+    "data-umami-event": "Join Us Btn Click",
   },
 ]);
 

nuxt.config.ts

@@ -68,7 +68,7 @@ export default defineNuxtConfig({
     },
   },
   site: {
-    url: "https://yphsalumni.com",
+    url: "https://yphsalumni.org",
     name: "永中校友会 YPHS Alumni",
   },
 });