Summary:
The current website defaults to using JavaScript for any code block, regardless of language tag. This PR adds syntax highlighting support by passing the necessary language prop and by adding any missing languages to Marked.js.
Depends on #14212, #14065
Closes https://github.com/facebook/react-native/pull/14215
Differential Revision: D5149897
Pulled By: hramos
fbshipit-source-id: 95a817af2168d5743c75dd1ac030d399a68fb93c