add explicit titles for pages without h1

yyx990803 · yyx990803 · commit 782da0cda6b0 · 2022-01-20T07:44:21.000+08:00
diff --git a/src/api/index.md b/src/api/index.md
@@ -1,4 +1,5 @@
 ---
+title: API Reference
 sidebar: false
 page: true
 footer: false
diff --git a/src/examples/index.md b/src/examples/index.md
@@ -1,5 +1,6 @@
 ---
 page: true
+title: Examples
 aside: false
 footer: false
 returnToTop: false
diff --git a/src/index.md b/src/index.md
@@ -1,5 +1,6 @@
 ---
 page: true
+title: Vue.js - The Progressive JavaScript Framework
 ---
 
 <script setup>
diff --git a/src/tutorial/index.md b/src/tutorial/index.md
@@ -1,5 +1,6 @@
 ---
 page: true
+title: Tutorial
 sidebar: false
 aside: false
 footer: false
