fix lighthouse errors

kazupon · kazupon · commit b2972573772b · 2021-01-27T17:14:27.000+09:00
diff --git a/.vitepress/theme/Info.vue b/.vitepress/theme/Info.vue
@@ -12,6 +12,7 @@
         href="https://www.ceroan.co.jp/"
         aria-label="ceroan LLC"
         target="_blank"
+        rel="noopener"
       >
         ceroan LLC
       </a>
diff --git a/index.md b/index.md
@@ -1,6 +1,7 @@
 ---
 home: true
 heroImage: hero_logo.png
+heroAlt: Intlify
 license: Released under the MIT License
 copyright: Copyright © 2021 kazuya kawaguchi
 ---
