chore(deps): bump @docusaurus/preset-classic in /docs (#222)

Bumps [@docusaurus/preset-classic](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus-preset-classic) from 2.0.0-beta.0 to 2.0.0-beta.1.
- [Release notes](https://github.com/facebook/docusaurus/releases)
- [Changelog](https://github.com/facebook/docusaurus/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/docusaurus/commits/v2.0.0-beta.1/packages/docusaurus-preset-classic)

---
updated-dependencies:
- dependency-name: "@docusaurus/preset-classic"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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docs/package.json

@@ -13,7 +13,7 @@
   },
   "dependencies": {
     "@docusaurus/core": "^2.0.0-beta.2",
-    "@docusaurus/preset-classic": "^2.0.0-beta.0",
+    "@docusaurus/preset-classic": "^2.0.0-beta.2",
     "@mdx-js/react": "^1.6.22",
     "clsx": "^1.1.1",
     "react": "^17.0.2",