Add code block titles and npm2yarn

[JLHwung]

• Per Nicolò's Slack comments, added code block titles. Some code blocks, mostly Babel configs, are assigned with meaningful names, such as babel.config.js. Others are assigned the language type.

• Added npm2yarn plugin, now every npm install instruction comes with yarn's equivalent one for free.

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[nicolo-ribaudo]

Awesome! It would be cool if npm2yarn also supported pnpm, but I couldn't find anything on Google.

[JLHwung]

@nicolo-ribaudo The remark plugin is straightforward:

https://github.com/facebook/docusaurus/blob/main/packages/docusaurus-remark-plugin-npm2yarn/src/index.ts

as long as we can figure out how to transform npm commands to the pnpm equivalents, we can enhance it and use our own plugin.