docs: update document.title to improve SEO (#210)

Author: afc163

.dumi/pages/404/index.tsx

@@ -48,7 +48,7 @@ const NotFoundPage: React.FC<NotFoundProps> = ({ router }) => {
       extra={
         <Link to={utils.getLocalizedPathname('/', isZhCN)}>
           <Button type="primary" icon={<HomeOutlined />}>
-            {isZhCN ? '返回 Ant Design 首页' : 'Back to home page'}
+            {isZhCN ? '返回 Ant Design X 首页' : 'Back to home page'}
           </Button>
         </Link>
       }

.dumi/pages/theme-editor/index.tsx

@@ -67,8 +67,8 @@ const CustomTheme: React.FC = () => {
   return (
     <div className={styles.editor}>
       <Helmet>
-        <title>{`${locale.title} - Ant Design`}</title>
-        <meta property="og:title" content={`${locale.title} - Ant Design`} />
+        <title>{`${locale.title} - Ant Design X`}</title>
+        <meta property="og:title" content={`${locale.title} - Ant Design X`} />
       </Helmet>
       <Suspense fallback={<Skeleton style={{ margin: 24 }} />}>
         <ThemeEditor

.dumi/theme/common/CommonHelmet.tsx

@@ -1,17 +1,17 @@
-import React from 'react';
 import { Helmet, useRouteMeta } from 'dumi';
+import React from 'react';
 
 const CommonHelmet: React.FC = () => {
   const meta = useRouteMeta();
 
   const [title, description] = React.useMemo<[string, string]>(() => {
     let helmetTitle: string;
     if (!meta.frontmatter.subtitle && !meta.frontmatter.title) {
-      helmetTitle = '404 Not Found - Ant Design';
+      helmetTitle = '404 Not Found - Ant Design X';
     } else {
       helmetTitle = `${meta.frontmatter.subtitle || ''} ${
         meta.frontmatter?.title || ''
-      } - Ant Design`;
+      } - Ant Design X`;
     }
     const helmetDescription = meta.frontmatter.description || '';
     return [helmetTitle, helmetDescription];

.dumi/theme/layouts/IndexLayout/index.tsx

@@ -14,7 +14,9 @@ const IndexLayout: React.FC<PropsWithChildren<IndexLayoutProps>> = (props) => {
   return (
     <>
       <Helmet>
-        <title>{title}</title>
+        <title>
+          {title} - {desc}
+        </title>
         <meta property="og:title" content={title} />
         {desc && <meta name="description" content={desc} />}
       </Helmet>