Improve TDK

web/public/index.html

@@ -5,10 +5,6 @@
     <link rel="icon" href="https://cdn.casbin.com/static/favicon.ico" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <meta name="theme-color" content="#000000" />
-    <meta
-      name="description"
-      content="Web site created using create-react-app"
-    />
     <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
     <!--
       manifest.json provides metadata used when your web app is installed on a

web/src/Conference.js

@@ -213,6 +213,14 @@ class Conference extends React.Component {
         {/* </div>*/}
         <Helmet>
           <title>{this.props.language !== "en" ? `${treeItem.title} - ${Conf.title}` : `${treeItem.titleEn} - ${Conf.titleEn}`}</title>
+          <meta
+            name="description"
+            content={this.state.language !== "en" ? treeItem.content : treeItem.contentEn}
+          />
+          <meta
+            name="keywords"
+            content={this.state.language !== "en" ? treeItem.title : treeItem.titleEn}
+          />
         </Helmet>
         <div style={{marginTop: "40px"}} dangerouslySetInnerHTML={{__html: this.props.language !== "en" ? treeItem.content : treeItem.contentEn}} />
       </div>

web/src/HomePage.js

@@ -90,6 +90,14 @@ class HomePage extends React.Component {
       <div>
         <Helmet>
           <title>{this.state.language !== "en" ? Conf.title : Conf.titleEn}</title>
+          <meta
+            name="description"
+            content={this.state.language !== "en" ? Conf.title : Conf.titleEn}
+          />
+          <meta
+            name="keywords"
+            content={this.state.language !== "en" ? Conf.title : Conf.titleEn}
+          />
         </Helmet>
         <div style={{marginBottom: "-8px"}}>
           {