Update Copyright info.

Author: cloudwebrtc

docusaurus.config.js

@@ -85,7 +85,7 @@ module.exports = {
           ],
         },
       ],
-      copyright: `Copyright © ${new Date().getFullYear()} Flutter-WebRTC Project, Inc. Built with Docusaurus.`,
+      copyright: `Copyright © ${new Date().getFullYear()} Flutter-WebRTC Project.`,
     },
     prism: {
       theme: lightCodeTheme,

i18n/zh-cn/docusaurus-theme-classic/footer.json

@@ -36,7 +36,7 @@
     "description": "The label of footer link with label=GitHub linking to https://github.com/flutter-webrtc"
   },
   "copyright": {
-    "message": "版权所有 © 2021 Flutter-WebRTC Project. 使用 Docusaurus 构建.",
+    "message": "版权所有 © 2021 Flutter-WebRTC Project.",
     "description": "The footer copyright"
   }
 }