[Docs] Babel package names are outdated

Currently, on the page Add React to a Website in the section "Add JSX to a Project", the instructions are to run

npm install babel-cli@6 babel-preset-react-app@3

These packages have been renamed @babel/cli and @babel/preset-react, respectively, so this should be updated.

I believe the next command with --presets react-app/prod should also be changed to --presets @babel/preset-react.

Thank you!

先檢查連結的 pull request #4624，然後開啟「將 JSX 新增至專案」區段所在的「將 React 新增至網站」頁面。更新過時的套件名稱和 --presets 指令，接著確認文件顯示目前的 Babel 套件名稱。