Bump infra

[JLHwung]

Implements https://github.com/babel/website/pull/2725#pullrequestreview-1304616372, now the npm install tabs shows pnpm equivalent commands.

The emotion framework is bumped to v11 because of the annoying t.isModuleDeclaration deprecation message from babel-plugin-emotion. 😄

Test link:

• REPL where emotion is heavily used: https://deploy-preview-2763--babel.netlify.app/repl
• npm-install tab: https://deploy-preview-2763--babel.netlify.app/docs/#jsx-and-react

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