Fix prism-react-renderer v2 theme import breaking Docusaurus build

[Copilot]

docusaurus.config.js used the prism-react-renderer v1 subpath API while package.json pins v2.4.1, which dropped those subpath exports — causing a MODULE_NOT_FOUND error that prevented the config from loading at all.

Changes

• docusaurus.config.js: Replace deprecated v1 subpath imports with the v2 themes named export:

// Before (v1 API — no longer valid in v2)
const lightCodeTheme = require('prism-react-renderer/themes/github');
const darkCodeTheme  = require('prism-react-renderer/themes/dracula');

// After (v2 API)
const {themes: prismThemes} = require('prism-react-renderer');
const lightCodeTheme = prismThemes.github;
const darkCodeTheme  = prismThemes.dracula;

[netlify]

❌ Deploy Preview for scifracx failed.

Name	Link
🔨 Latest commit	f1d8c27
🔍 Latest deploy log	https://app.netlify.com/projects/scifracx/deploys/6a2917348f528200082112c9