docs: tweaks

Author: QingWei-Li

docs/index.html

@@ -6,6 +6,7 @@
   <link rel="icon" href="_media/favicon.ico">
   <meta name="keywords" content="doc,docs,documentation,gitbook,creator,generator,github,jekyll,github-pages">
   <meta name="description" content="A magical documentation generator.">
+  <meta name="google-site-verification" content="6t0LoIeFksrjF4c9sqUEsVXiQNxLp2hgoqo0KryT-sE" />
   <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
   <link rel="stylesheet" href="//unpkg.com/docsify/lib/themes/vue.css" title="vue">
   <link rel="stylesheet" href="//unpkg.com/docsify/lib/themes/dark.css" title="dark" disabled>