Support for prism-react-renderer v2.0.2

[laviniat1996]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Motivation

A new version for prism-react-renderer is available, after of long pause. Maybe it would be helpful for Docusaurus to support this new version.

Self-service

• I'd be willing to do some initial work on this proposal myself.

[josephpage]

In fact, if you are using a Docusaurus configuration that is only little changed from the default, you can upgrade prism-react-renderer to v2 in your package.json even if Docusaurus continues to use v1 internally. To do this, you just need to change this lines in your docusaurus.config.js file:

const lightCodeTheme = require('prism-react-renderer/themes/github');
const darkCodeTheme = require('prism-react-renderer/themes/dracula');

by the following:

const lightCodeTheme = require('prism-react-renderer').themes.github;
const darkCodeTheme = require('prism-react-renderer').themes.dracula;

(remembering to adjust the themes names to match your wishes)