docs: 增加百度 site verification（文件验证）

aio/angular.json

@@ -36,6 +36,7 @@
               "src/favicon.ico",
               "src/pwa-manifest.json",
               "src/google44a5c950a9a9b940.html",
+              "src/baidu_verify_AD8wvnfKCx.html",
               {
                 "glob": "custom-elements.min.js",
                 "input": "node_modules/@webcomponents/custom-elements",
@@ -126,6 +127,7 @@
               "src/favicon.ico",
               "src/pwa-manifest.json",
               "src/google44a5c950a9a9b940.html",
+              "src/baidu_verify_AD8wvnfKCx.html",
               {
                 "glob": "custom-elements.min.js",
                 "input": "node_modules/@webcomponents/custom-elements",

aio/src/baidu_verify_AD8wvnfKCx.html

@@ -0,0 +1 @@
+AD8wvnfKCx

aio/src/index.html

@@ -6,7 +6,6 @@
   <base href="/">
 
   <meta name="viewport" content="width=device-width, initial-scale=1">
-  <meta name="baidu-site-verification" content="AD8wvnfKCx" />
 
   <link rel="icon" type="image/x-icon" href="favicon.ico">
   <link rel="icon" type="image/x-icon" href="assets/images/favicons/favicon.ico">