Add chinese docs (#17954)

* add docs chinese i18n

* fix some broken links

* update some i18n

* update chinese docs

* add chinese community docs

* Change docs i18n chinese label

docs/src/theme/Navbar/index.js

@@ -0,0 +1,15 @@
+import React from 'react';
+import NavbarLayout from '@theme/Navbar/Layout';
+import NavbarContent from '@theme/Navbar/Content';
+import LanguageAlert from '../../components/LanguageAlert';
+
+export default function Navbar() {
+  return (
+    <>
+      <NavbarLayout>
+        <NavbarContent />
+      </NavbarLayout>
+      <LanguageAlert />
+    </>
+  );
+}