message: remove dup link hreflang
diff: <link rel="icon" type="image/png" href="/docs/assets/img/meta/favicon-32x32.png" sizes="32x32">
  <link rel="icon" type="image/png" href="/docs/assets/img/meta/favicon-96x96.png" sizes="96x96">
  - <link rel="alternate" hreflang="x-default" href="https://ionicframework.com/docs/" class="meta-url" />
  <link rel="alternate" hreflang="x-default" href="https://ionicframework.com/docs/" class="meta-url" />
  <link rel="alternate" hreflang="ja" href="https://ionicframework.com/jp/docs/" class="meta-url" />
  -
  </head>
  <body>
  